107 files changed, 4782 insertions, 2368 deletions

diff --git a/apps/plugins/puzzles/help/blackbox.c b/apps/plugins/puzzles/help/blackbox.c
index d5f5e0ca91..fa194ff4cd 100644
--- a/apps/plugins/puzzles/help/blackbox.c
+++ b/apps/plugins/puzzles/help/blackbox.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 5427 comp 3142 ratio 0.578957 level 11 saved 2285 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/bridges.c b/apps/plugins/puzzles/help/bridges.c
index 93461e48c4..f0e9077662 100644
--- a/apps/plugins/puzzles/help/bridges.c
+++ b/apps/plugins/puzzles/help/bridges.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 5211 comp 3117 ratio 0.598158 level 11 saved 2094 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/cube.c b/apps/plugins/puzzles/help/cube.c
index 71644ef6fa..5111704665 100644
--- a/apps/plugins/puzzles/help/cube.c
+++ b/apps/plugins/puzzles/help/cube.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2051 comp 1450 ratio 0.706972 level 11 saved 601 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/dominosa.c b/apps/plugins/puzzles/help/dominosa.c
index 49db9a9d43..92e5f285e5 100644
--- a/apps/plugins/puzzles/help/dominosa.c
+++ b/apps/plugins/puzzles/help/dominosa.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2276 comp 1548 ratio 0.680141 level 11 saved 728 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/fifteen.c b/apps/plugins/puzzles/help/fifteen.c
index fa831f0c77..7ab9daa975 100644
--- a/apps/plugins/puzzles/help/fifteen.c
+++ b/apps/plugins/puzzles/help/fifteen.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 1248 comp 937 ratio 0.750801 level 5 saved 311 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/filling.c b/apps/plugins/puzzles/help/filling.c
index 557d672325..d2caed8c6d 100644
--- a/apps/plugins/puzzles/help/filling.c
+++ b/apps/plugins/puzzles/help/filling.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 1796 comp 1242 ratio 0.691537 level 11 saved 554 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/flip.c b/apps/plugins/puzzles/help/flip.c
index ec4ffad0d2..113ae7975c 100644
--- a/apps/plugins/puzzles/help/flip.c
+++ b/apps/plugins/puzzles/help/flip.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 1521 comp 1101 ratio 0.723866 level 11 saved 420 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/flood.c b/apps/plugins/puzzles/help/flood.c
index c7f813c78a..f2139b23af 100644
--- a/apps/plugins/puzzles/help/flood.c
+++ b/apps/plugins/puzzles/help/flood.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2375 comp 1591 ratio 0.669895 level 11 saved 784 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/galaxies.c b/apps/plugins/puzzles/help/galaxies.c
index b0d14a6cbb..7358a70ea4 100644
--- a/apps/plugins/puzzles/help/galaxies.c
+++ b/apps/plugins/puzzles/help/galaxies.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2504 comp 1733 ratio 0.692093 level 11 saved 771 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/guess.c b/apps/plugins/puzzles/help/guess.c
index 48a8a23c44..d59e861737 100644
--- a/apps/plugins/puzzles/help/guess.c
+++ b/apps/plugins/puzzles/help/guess.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 3030 comp 1882 ratio 0.621122 level 11 saved 1148 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/inertia.c b/apps/plugins/puzzles/help/inertia.c
index 080f302837..e92531fbf1 100644
--- a/apps/plugins/puzzles/help/inertia.c
+++ b/apps/plugins/puzzles/help/inertia.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2265 comp 1577 ratio 0.696247 level 11 saved 688 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/keen.c b/apps/plugins/puzzles/help/keen.c
index e31f9b2c1f..691c23e1f6 100644
--- a/apps/plugins/puzzles/help/keen.c
+++ b/apps/plugins/puzzles/help/keen.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 3936 comp 2381 ratio 0.604929 level 11 saved 1555 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/lightup.c b/apps/plugins/puzzles/help/lightup.c
index df6609f3e3..116e7c7a82 100644
--- a/apps/plugins/puzzles/help/lightup.c
+++ b/apps/plugins/puzzles/help/lightup.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2314 comp 1548 ratio 0.668971 level 11 saved 766 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/loopy.c b/apps/plugins/puzzles/help/loopy.c
index 5a13c4ed94..87ff5ae42b 100644
--- a/apps/plugins/puzzles/help/loopy.c
+++ b/apps/plugins/puzzles/help/loopy.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2264 comp 1613 ratio 0.712456 level 11 saved 651 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/magnets.c b/apps/plugins/puzzles/help/magnets.c
index 1d016220e0..0cc3819d83 100644
--- a/apps/plugins/puzzles/help/magnets.c
+++ b/apps/plugins/puzzles/help/magnets.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2498 comp 1657 ratio 0.663331 level 11 saved 841 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/map.c b/apps/plugins/puzzles/help/map.c
index 6e843207e4..4a48ff9483 100644
--- a/apps/plugins/puzzles/help/map.c
+++ b/apps/plugins/puzzles/help/map.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 3464 comp 2297 ratio 0.663106 level 11 saved 1167 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/mines.c b/apps/plugins/puzzles/help/mines.c
index 1b952f47c7..a568ad8b9f 100644
--- a/apps/plugins/puzzles/help/mines.c
+++ b/apps/plugins/puzzles/help/mines.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 3796 comp 2357 ratio 0.620917 level 11 saved 1439 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/net.c b/apps/plugins/puzzles/help/net.c
index a27792a82a..552f707d0e 100644
--- a/apps/plugins/puzzles/help/net.c
+++ b/apps/plugins/puzzles/help/net.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 3445 comp 2367 ratio 0.687083 level 11 saved 1078 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/netslide.c b/apps/plugins/puzzles/help/netslide.c
index 34ee2eed31..a090d38649 100644
--- a/apps/plugins/puzzles/help/netslide.c
+++ b/apps/plugins/puzzles/help/netslide.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 524 comp 416 ratio 0.793893 level 3 saved 108 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/palisade.c b/apps/plugins/puzzles/help/palisade.c
index 713720ab6a..ea4221551a 100644
--- a/apps/plugins/puzzles/help/palisade.c
+++ b/apps/plugins/puzzles/help/palisade.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 1110 comp 894 ratio 0.805405 level 3 saved 216 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/pattern.c b/apps/plugins/puzzles/help/pattern.c
index 2671ae9c89..9c764038cb 100644
--- a/apps/plugins/puzzles/help/pattern.c
+++ b/apps/plugins/puzzles/help/pattern.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2123 comp 1468 ratio 0.691474 level 4 saved 655 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/pearl.c b/apps/plugins/puzzles/help/pearl.c
index b444d2c6d1..ba9509f31a 100644
--- a/apps/plugins/puzzles/help/pearl.c
+++ b/apps/plugins/puzzles/help/pearl.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2565 comp 1606 ratio 0.626121 level 11 saved 959 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/pegs.c b/apps/plugins/puzzles/help/pegs.c
index eefeea99c7..7498601e32 100644
--- a/apps/plugins/puzzles/help/pegs.c
+++ b/apps/plugins/puzzles/help/pegs.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 1686 comp 1254 ratio 0.743772 level 3 saved 432 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/range.c b/apps/plugins/puzzles/help/range.c
index 1b5dc9d661..6ff8adaefe 100644
--- a/apps/plugins/puzzles/help/range.c
+++ b/apps/plugins/puzzles/help/range.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2029 comp 1393 ratio 0.686545 level 4 saved 636 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/rect.c b/apps/plugins/puzzles/help/rect.c
index 59c31a0c74..f4175e311d 100644
--- a/apps/plugins/puzzles/help/rect.c
+++ b/apps/plugins/puzzles/help/rect.c
@@ -1,5 +1,5 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
-/* orig 3534 comp 2351 ratio 0.665252 level 11 saved 1183 */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
+/* orig 3533 comp 2352 ratio 0.665723 level 11 saved 1181 */
 /* DO NOT EDIT! */
 
 const char help_text[] = {
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+0x0a, 0x00, 
 };
-const unsigned short help_text_len = 3534;
+const unsigned short help_text_len = 3533;
 const char quick_help_text[] = "Divide the grid into rectangles with areas equal to the numbers.";
diff --git a/apps/plugins/puzzles/help/samegame.c b/apps/plugins/puzzles/help/samegame.c
index e9cac91bde..6f45c4b1e9 100644
--- a/apps/plugins/puzzles/help/samegame.c
+++ b/apps/plugins/puzzles/help/samegame.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2464 comp 1626 ratio 0.659903 level 11 saved 838 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/signpost.c b/apps/plugins/puzzles/help/signpost.c
index 8e5cffdf27..d57da481de 100644
--- a/apps/plugins/puzzles/help/signpost.c
+++ b/apps/plugins/puzzles/help/signpost.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 3045 comp 1899 ratio 0.623645 level 11 saved 1146 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/singles.c b/apps/plugins/puzzles/help/singles.c
index 9dfeb2132a..81de65dd67 100644
--- a/apps/plugins/puzzles/help/singles.c
+++ b/apps/plugins/puzzles/help/singles.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 1385 comp 1059 ratio 0.764621 level 11 saved 326 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/sixteen.c b/apps/plugins/puzzles/help/sixteen.c
index e0b5981f64..cd2d9ebfc0 100644
--- a/apps/plugins/puzzles/help/sixteen.c
+++ b/apps/plugins/puzzles/help/sixteen.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2533 comp 1760 ratio 0.694828 level 11 saved 773 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/slant.c b/apps/plugins/puzzles/help/slant.c
index c1531381dc..8814960d2d 100644
--- a/apps/plugins/puzzles/help/slant.c
+++ b/apps/plugins/puzzles/help/slant.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2374 comp 1659 ratio 0.698821 level 11 saved 715 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/solo.c b/apps/plugins/puzzles/help/solo.c
index 12ca46862d..8efb2a9308 100644
--- a/apps/plugins/puzzles/help/solo.c
+++ b/apps/plugins/puzzles/help/solo.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 6245 comp 3641 ratio 0.583026 level 11 saved 2604 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/tents.c b/apps/plugins/puzzles/help/tents.c
index cb4b288d3e..3631abdeac 100644
--- a/apps/plugins/puzzles/help/tents.c
+++ b/apps/plugins/puzzles/help/tents.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2139 comp 1397 ratio 0.653109 level 11 saved 742 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/towers.c b/apps/plugins/puzzles/help/towers.c
index f3812bc409..98a26949bf 100644
--- a/apps/plugins/puzzles/help/towers.c
+++ b/apps/plugins/puzzles/help/towers.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 3527 comp 2209 ratio 0.626311 level 11 saved 1318 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/tracks.c b/apps/plugins/puzzles/help/tracks.c
index df192e3b59..400c02bbf1 100644
--- a/apps/plugins/puzzles/help/tracks.c
+++ b/apps/plugins/puzzles/help/tracks.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 1858 comp 1275 ratio 0.686222 level 11 saved 583 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/twiddle.c b/apps/plugins/puzzles/help/twiddle.c
index a9aaf4182f..3132a59c23 100644
--- a/apps/plugins/puzzles/help/twiddle.c
+++ b/apps/plugins/puzzles/help/twiddle.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 2914 comp 1863 ratio 0.639327 level 11 saved 1051 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/undead.c b/apps/plugins/puzzles/help/undead.c
index d3590996f1..b0ad6e4d71 100644
--- a/apps/plugins/puzzles/help/undead.c
+++ b/apps/plugins/puzzles/help/undead.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 3275 comp 2117 ratio 0.646412 level 11 saved 1158 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/unequal.c b/apps/plugins/puzzles/help/unequal.c
index 9d5712c073..a6b1c4a6b6 100644
--- a/apps/plugins/puzzles/help/unequal.c
+++ b/apps/plugins/puzzles/help/unequal.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 3917 comp 2359 ratio 0.602247 level 11 saved 1558 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/unruly.c b/apps/plugins/puzzles/help/unruly.c
index 07355e56db..baa0bfe6d4 100644
--- a/apps/plugins/puzzles/help/unruly.c
+++ b/apps/plugins/puzzles/help/unruly.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 1684 comp 1231 ratio 0.730998 level 11 saved 453 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/help/untangle.c b/apps/plugins/puzzles/help/untangle.c
index b6b398c65b..c75520a021 100644
--- a/apps/plugins/puzzles/help/untangle.c
+++ b/apps/plugins/puzzles/help/untangle.c
@@ -1,4 +1,4 @@
-/* auto-generated on Aug 16 2017 by genhelp.sh */
+/* auto-generated on Oct 23 2017 by genhelp.sh */
 /* orig 747 comp 620 ratio 0.829987 level 4 saved 127 */
 /* DO NOT EDIT! */
 
diff --git a/apps/plugins/puzzles/src/Buildscr b/apps/plugins/puzzles/src/Buildscr
index b8a585b43e..4a54d277ff 100644
--- a/apps/plugins/puzzles/src/Buildscr
+++ b/apps/plugins/puzzles/src/Buildscr
@@ -25,7 +25,7 @@ in puzzles do echo '$#define VER "Version $(Version)"' >> version.h
 in puzzles do perl -i -pe 's/Unidentified build/$(Version)/' osx-info.plist
 
 # First build some local binaries, to run the icon build.
-in puzzles do perl mkfiles.pl -U
+in puzzles do perl mkfiles.pl -U CFLAGS='-Wwrite-strings -Werror'
 in puzzles do make
 
 # Now build the screenshots and icons.
@@ -45,7 +45,7 @@ in puzzles do ./mkauto.sh
 # Build the OS X .dmg archive.
 delegate osx
   in puzzles do make -f Makefile.osx clean
-  in puzzles do make -f Makefile.osx release VER=-DVER=$(Version)
+  in puzzles do make -f Makefile.osx release VER=-DVER=$(Version) XFLAGS='-Wwrite-strings -Werror'
   return puzzles/Puzzles.dmg
 enddelegate
 
@@ -56,7 +56,7 @@ in puzzles do mason.pl --args '{"version":"$(Version)","descfile":"gamedesc.txt"
 in puzzles do perl winiss.pl $(Version) gamedesc.txt > puzzles.iss
 ifneq "$(VISUAL_STUDIO)" "yes" then
   in puzzles with clangcl64 do Platform=x64 make -f Makefile.clangcl clean
-  in puzzles with clangcl64 do Platform=x64 make -f Makefile.clangcl VER=-DVER=$(Version)
+  in puzzles with clangcl64 do Platform=x64 make -f Makefile.clangcl VER=-DVER=$(Version) XFLAGS='-Wwrite-strings -Werror'
   # Code-sign the binaries, if the local bob config provides a script
   # to do so. We assume here that the script accepts an -i option to
   # provide a 'more info' URL, and an optional -n option to provide a
@@ -144,7 +144,7 @@ ifneq "$(JAVA_UNFINISHED)" "" in puzzles do perl mkfiles.pl
 
 # Build the Java applets.
 delegate nestedvm
-  in puzzles do make -f Makefile.nestedvm NESTEDVM="$$NESTEDVM" VER=-DVER=$(Version)
+  in puzzles do make -f Makefile.nestedvm NESTEDVM="$$NESTEDVM" VER=-DVER=$(Version) XFLAGS="-Wwrite-strings -Werror"
   return puzzles/*.jar
 enddelegate
 
@@ -154,7 +154,7 @@ enddelegate
 in puzzles do mkdir js # so we can tell output .js files from emcc*.js
 delegate emscripten
   in puzzles do make -f Makefile.emcc OUTPREFIX=js/ clean
-  in puzzles do make -f Makefile.emcc OUTPREFIX=js/
+  in puzzles do make -f Makefile.emcc OUTPREFIX=js/ XFLAGS="-Wwrite-strings -Werror"
   return puzzles/js/*.js
 enddelegate
 
diff --git a/apps/plugins/puzzles/src/Makefile b/apps/plugins/puzzles/src/Makefile
index 09acd2dd39..a0fc6c5e74 100644
--- a/apps/plugins/puzzles/src/Makefile
+++ b/apps/plugins/puzzles/src/Makefile
@@ -1,719 +1,2603 @@
-# Makefile for puzzles under X/GTK and Unix.
+# Makefile.in generated by automake 1.15.1 from Makefile.am.
+# Makefile.  Generated from Makefile.in by configure.
+
+# Copyright (C) 1994-2017 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+
+
+# Makefile.am for puzzles under Unix with Autoconf/Automake.
 #
 # This file was created by `mkfiles.pl' from the `Recipe' file.
 # DO NOT EDIT THIS FILE DIRECTLY; edit Recipe or mkfiles.pl instead.
 
-# You can define this path to point at your tools if you need to
-# TOOLPATH = /opt/gcc/bin
-CC := $(TOOLPATH)$(CC)
-# You can manually set this to `gtk-config' or `pkg-config gtk+-1.2'
-# (depending on what works on your system) if you want to enforce
-# building with GTK 1.2, or you can set it to `pkg-config gtk+-2.0'
-# if you want to enforce 2.0. The default is to try 2.0 and fall back
-# to 1.2 if it isn't found.
-GTK_CONFIG = sh -c 'pkg-config gtk+-2.0 $$0 2>/dev/null || gtk-config $$0'
-
-CFLAGS := -O2 -Wall -ansi -pedantic -g -I./ -Iicons/ `$(GTK_CONFIG) \
-                --cflags` $(CFLAGS)
-XLIBS = `$(GTK_CONFIG) --libs` -lm
-ULIBS = -lm#
-INSTALL=install
-INSTALL_PROGRAM=$(INSTALL)
-INSTALL_DATA=$(INSTALL)
-prefix=/usr/local
-exec_prefix=$(prefix)
-bindir=$(exec_prefix)/bin
-gamesdir=$(exec_prefix)/games
-mandir=$(prefix)/man
-man1dir=$(mandir)/man1
-
-all: $(BINPREFIX)blackbox $(BINPREFIX)bridges $(BINPREFIX)cube \
-                $(BINPREFIX)dominosa $(BINPREFIX)fifteen \
-                $(BINPREFIX)fifteensolver $(BINPREFIX)filling \
-                $(BINPREFIX)fillingsolver $(BINPREFIX)flip $(BINPREFIX)flood \
-                $(BINPREFIX)galaxies $(BINPREFIX)galaxiespicture \
-                $(BINPREFIX)galaxiessolver $(BINPREFIX)guess \
-                $(BINPREFIX)inertia $(BINPREFIX)keen $(BINPREFIX)keensolver \
-                $(BINPREFIX)latincheck $(BINPREFIX)lightup \
-                $(BINPREFIX)lightupsolver $(BINPREFIX)loopy \
-                $(BINPREFIX)loopysolver $(BINPREFIX)magnets \
-                $(BINPREFIX)magnetssolver $(BINPREFIX)map \
-                $(BINPREFIX)mapsolver $(BINPREFIX)mineobfusc \
-                $(BINPREFIX)mines $(BINPREFIX)net $(BINPREFIX)netslide \
-                $(BINPREFIX)nullgame $(BINPREFIX)obfusc $(BINPREFIX)palisade \
-                $(BINPREFIX)pattern $(BINPREFIX)patternpicture \
-                $(BINPREFIX)patternsolver $(BINPREFIX)pearl \
-                $(BINPREFIX)pearlbench $(BINPREFIX)pegs $(BINPREFIX)range \
-                $(BINPREFIX)rect $(BINPREFIX)samegame $(BINPREFIX)signpost \
-                $(BINPREFIX)signpostsolver $(BINPREFIX)singles \
-                $(BINPREFIX)singlessolver $(BINPREFIX)sixteen \
-                $(BINPREFIX)slant $(BINPREFIX)slantsolver $(BINPREFIX)solo \
-                $(BINPREFIX)solosolver $(BINPREFIX)tents \
-                $(BINPREFIX)tentssolver $(BINPREFIX)towers \
-                $(BINPREFIX)towerssolver $(BINPREFIX)tracks \
-                $(BINPREFIX)twiddle $(BINPREFIX)undead $(BINPREFIX)unequal \
-                $(BINPREFIX)unequalsolver $(BINPREFIX)unruly \
-                $(BINPREFIX)unrulysolver $(BINPREFIX)untangle
-
-$(BINPREFIX)blackbox: blackbox.o drawing.o gtk.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o version.o
-        $(CC) -o $@ blackbox.o drawing.o gtk.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)bridges: bridges.o drawing.o dsf.o findloop.o gtk.o malloc.o \
-                midend.o misc.o no-icon.o printing.o ps.o random.o version.o
-        $(CC) -o $@ bridges.o drawing.o dsf.o findloop.o gtk.o malloc.o \
-                midend.o misc.o no-icon.o printing.o ps.o random.o version.o \
-                 $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)cube: cube.o drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o version.o
-        $(CC) -o $@ cube.o drawing.o gtk.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)dominosa: dominosa.o drawing.o gtk.o laydomino.o malloc.o \
-                midend.o misc.o no-icon.o printing.o ps.o random.o version.o
-        $(CC) -o $@ dominosa.o drawing.o gtk.o laydomino.o malloc.o midend.o \
-                misc.o no-icon.o printing.o ps.o random.o version.o  \
-                $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)fifteen: drawing.o fifteen.o gtk.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o version.o
-        $(CC) -o $@ drawing.o fifteen.o gtk.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)fifteensolver: fifteen2.o malloc.o misc.o nullfe.o random.o
-        $(CC) -o $@ fifteen2.o malloc.o misc.o nullfe.o random.o  $(XLFLAGS) \
-                $(ULIBS)
-
-$(BINPREFIX)filling: drawing.o dsf.o filling.o gtk.o malloc.o midend.o \
-                misc.o no-icon.o printing.o ps.o random.o version.o
-        $(CC) -o $@ drawing.o dsf.o filling.o gtk.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)fillingsolver: dsf.o filling2.o malloc.o misc.o nullfe.o \
-                random.o
-        $(CC) -o $@ dsf.o filling2.o malloc.o misc.o nullfe.o random.o  \
-                $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)flip: drawing.o flip.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o tree234.o version.o
-        $(CC) -o $@ drawing.o flip.o gtk.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o tree234.o version.o  \
-                $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)flood: drawing.o flood.o gtk.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o version.o
-        $(CC) -o $@ drawing.o flood.o gtk.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)galaxies: drawing.o dsf.o galaxies.o gtk.o malloc.o midend.o \
-                misc.o no-icon.o printing.o ps.o random.o version.o
-        $(CC) -o $@ drawing.o dsf.o galaxies.o gtk.o malloc.o midend.o \
-                misc.o no-icon.o printing.o ps.o random.o version.o  \
-                $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)galaxiespicture: dsf.o galaxie4.o malloc.o misc.o nullfe.o \
-                random.o
-        $(CC) -o $@ dsf.o galaxie4.o malloc.o misc.o nullfe.o random.o -lm \
-                $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)galaxiessolver: dsf.o galaxie2.o malloc.o misc.o nullfe.o \
-                random.o
-        $(CC) -o $@ dsf.o galaxie2.o malloc.o misc.o nullfe.o random.o -lm \
-                $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)guess: drawing.o gtk.o guess.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o version.o
-        $(CC) -o $@ drawing.o gtk.o guess.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)inertia: drawing.o gtk.o inertia.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o version.o
-        $(CC) -o $@ drawing.o gtk.o inertia.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)keen: drawing.o dsf.o gtk.o keen.o latin.o malloc.o maxflow.o \
-                midend.o misc.o no-icon.o printing.o ps.o random.o tree234.o \
-                version.o
-        $(CC) -o $@ drawing.o dsf.o gtk.o keen.o latin.o malloc.o maxflow.o \
-                midend.o misc.o no-icon.o printing.o ps.o random.o tree234.o \
-                version.o  $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)keensolver: dsf.o keen2.o latin6.o malloc.o maxflow.o misc.o \
-                nullfe.o random.o tree234.o
-        $(CC) -o $@ dsf.o keen2.o latin6.o malloc.o maxflow.o misc.o \
-                nullfe.o random.o tree234.o  $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)latincheck: latin8.o malloc.o maxflow.o misc.o nullfe.o random.o \
-                tree234.o
-        $(CC) -o $@ latin8.o malloc.o maxflow.o misc.o nullfe.o random.o \
-                tree234.o  $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)lightup: combi.o drawing.o gtk.o lightup.o malloc.o midend.o \
-                misc.o no-icon.o printing.o ps.o random.o version.o
-        $(CC) -o $@ combi.o drawing.o gtk.o lightup.o malloc.o midend.o \
-                misc.o no-icon.o printing.o ps.o random.o version.o  \
-                $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)lightupsolver: combi.o lightup2.o malloc.o misc.o nullfe.o \
-                random.o
-        $(CC) -o $@ combi.o lightup2.o malloc.o misc.o nullfe.o random.o  \
-                $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)loopy: drawing.o dsf.o grid.o gtk.o loopgen.o loopy.o malloc.o \
-                midend.o misc.o no-icon.o penrose.o printing.o ps.o random.o \
-                tree234.o version.o
-        $(CC) -o $@ drawing.o dsf.o grid.o gtk.o loopgen.o loopy.o malloc.o \
-                midend.o misc.o no-icon.o penrose.o printing.o ps.o random.o \
-                tree234.o version.o  $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)loopysolver: dsf.o grid.o loopgen.o loopy2.o malloc.o misc.o \
-                nullfe.o penrose.o random.o tree234.o
-        $(CC) -o $@ dsf.o grid.o loopgen.o loopy2.o malloc.o misc.o nullfe.o \
-                penrose.o random.o tree234.o -lm $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)magnets: drawing.o gtk.o laydomino.o magnets.o malloc.o midend.o \
-                misc.o no-icon.o printing.o ps.o random.o version.o
-        $(CC) -o $@ drawing.o gtk.o laydomino.o magnets.o malloc.o midend.o \
-                misc.o no-icon.o printing.o ps.o random.o version.o  \
-                $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)magnetssolver: laydomino.o magnets2.o malloc.o misc.o nullfe.o \
-                random.o
-        $(CC) -o $@ laydomino.o magnets2.o malloc.o misc.o nullfe.o random.o \
-                -lm $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)map: drawing.o dsf.o gtk.o malloc.o map.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o version.o
-        $(CC) -o $@ drawing.o dsf.o gtk.o malloc.o map.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)mapsolver: dsf.o malloc.o map2.o misc.o nullfe.o random.o
-        $(CC) -o $@ dsf.o malloc.o map2.o misc.o nullfe.o random.o -lm \
-                $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)mineobfusc: malloc.o mines2.o misc.o nullfe.o random.o tree234.o
-        $(CC) -o $@ malloc.o mines2.o misc.o nullfe.o random.o tree234.o  \
-                $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)mines: drawing.o gtk.o malloc.o midend.o mines.o misc.o \
-                no-icon.o printing.o ps.o random.o tree234.o version.o
-        $(CC) -o $@ drawing.o gtk.o malloc.o midend.o mines.o misc.o \
-                no-icon.o printing.o ps.o random.o tree234.o version.o  \
-                $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)net: drawing.o dsf.o findloop.o gtk.o malloc.o midend.o misc.o \
-                net.o no-icon.o printing.o ps.o random.o tree234.o version.o
-        $(CC) -o $@ drawing.o dsf.o findloop.o gtk.o malloc.o midend.o \
-                misc.o net.o no-icon.o printing.o ps.o random.o tree234.o \
-                version.o  $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)netslide: drawing.o gtk.o malloc.o midend.o misc.o netslide.o \
-                no-icon.o printing.o ps.o random.o tree234.o version.o
-        $(CC) -o $@ drawing.o gtk.o malloc.o midend.o misc.o netslide.o \
-                no-icon.o printing.o ps.o random.o tree234.o version.o  \
-                $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)nullgame: drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                nullgame.o printing.o ps.o random.o version.o
-        $(CC) -o $@ drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                nullgame.o printing.o ps.o random.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)obfusc: malloc.o misc.o nullfe.o obfusc.o random.o
-        $(CC) -o $@ malloc.o misc.o nullfe.o obfusc.o random.o  $(XLFLAGS) \
-                $(ULIBS)
-
-$(BINPREFIX)palisade: divvy.o drawing.o dsf.o gtk.o malloc.o midend.o misc.o \
-                no-icon.o palisade.o printing.o ps.o random.o version.o
-        $(CC) -o $@ divvy.o drawing.o dsf.o gtk.o malloc.o midend.o misc.o \
-                no-icon.o palisade.o printing.o ps.o random.o version.o  \
-                $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)pattern: drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                pattern.o printing.o ps.o random.o version.o
-        $(CC) -o $@ drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                pattern.o printing.o ps.o random.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)patternpicture: malloc.o misc.o nullfe.o pattern4.o random.o
-        $(CC) -o $@ malloc.o misc.o nullfe.o pattern4.o random.o  $(XLFLAGS) \
-                $(ULIBS)
-
-$(BINPREFIX)patternsolver: malloc.o misc.o nullfe.o pattern2.o random.o
-        $(CC) -o $@ malloc.o misc.o nullfe.o pattern2.o random.o  $(XLFLAGS) \
-                $(ULIBS)
-
-$(BINPREFIX)pearl: drawing.o dsf.o grid.o gtk.o loopgen.o malloc.o midend.o \
-                misc.o no-icon.o pearl.o penrose.o printing.o ps.o random.o \
-                tdq.o tree234.o version.o
-        $(CC) -o $@ drawing.o dsf.o grid.o gtk.o loopgen.o malloc.o midend.o \
-                misc.o no-icon.o pearl.o penrose.o printing.o ps.o random.o \
-                tdq.o tree234.o version.o  $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)pearlbench: dsf.o grid.o loopgen.o malloc.o misc.o nullfe.o \
-                pearl2.o penrose.o random.o tdq.o tree234.o
-        $(CC) -o $@ dsf.o grid.o loopgen.o malloc.o misc.o nullfe.o pearl2.o \
-                penrose.o random.o tdq.o tree234.o -lm $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)pegs: drawing.o gtk.o malloc.o midend.o misc.o no-icon.o pegs.o \
-                printing.o ps.o random.o tree234.o version.o
-        $(CC) -o $@ drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                pegs.o printing.o ps.o random.o tree234.o version.o  \
-                $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)range: drawing.o dsf.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o range.o version.o
-        $(CC) -o $@ drawing.o dsf.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o range.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)rect: drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o rect.o version.o
-        $(CC) -o $@ drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o rect.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)samegame: drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o samegame.o version.o
-        $(CC) -o $@ drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o samegame.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)signpost: drawing.o dsf.o gtk.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o signpost.o version.o
-        $(CC) -o $@ drawing.o dsf.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o signpost.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)signpostsolver: dsf.o malloc.o misc.o nullfe.o random.o \
-                signpos2.o
-        $(CC) -o $@ dsf.o malloc.o misc.o nullfe.o random.o signpos2.o -lm \
-                $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)singles: drawing.o dsf.o gtk.o latin.o malloc.o maxflow.o \
-                midend.o misc.o no-icon.o printing.o ps.o random.o singles.o \
-                tree234.o version.o
-        $(CC) -o $@ drawing.o dsf.o gtk.o latin.o malloc.o maxflow.o \
-                midend.o misc.o no-icon.o printing.o ps.o random.o singles.o \
-                tree234.o version.o  $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)singlessolver: dsf.o latin.o malloc.o maxflow.o misc.o nullfe.o \
-                random.o singles3.o tree234.o
-        $(CC) -o $@ dsf.o latin.o malloc.o maxflow.o misc.o nullfe.o \
-                random.o singles3.o tree234.o  $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)sixteen: drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o sixteen.o version.o
-        $(CC) -o $@ drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o sixteen.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)slant: drawing.o dsf.o findloop.o gtk.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o slant.o version.o
-        $(CC) -o $@ drawing.o dsf.o findloop.o gtk.o malloc.o midend.o \
-                misc.o no-icon.o printing.o ps.o random.o slant.o version.o  \
-                $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)slantsolver: dsf.o findloop.o malloc.o misc.o nullfe.o random.o \
-                slant2.o
-        $(CC) -o $@ dsf.o findloop.o malloc.o misc.o nullfe.o random.o \
-                slant2.o  $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)solo: divvy.o drawing.o dsf.o gtk.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o solo.o version.o
-        $(CC) -o $@ divvy.o drawing.o dsf.o gtk.o malloc.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o solo.o version.o  \
-                $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)solosolver: divvy.o dsf.o malloc.o misc.o nullfe.o random.o \
-                solo2.o
-        $(CC) -o $@ divvy.o dsf.o malloc.o misc.o nullfe.o random.o solo2.o  \
-                $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)tents: drawing.o dsf.o gtk.o malloc.o maxflow.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o tents.o version.o
-        $(CC) -o $@ drawing.o dsf.o gtk.o malloc.o maxflow.o midend.o misc.o \
-                no-icon.o printing.o ps.o random.o tents.o version.o  \
-                $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)tentssolver: dsf.o malloc.o maxflow.o misc.o nullfe.o random.o \
-                tents3.o
-        $(CC) -o $@ dsf.o malloc.o maxflow.o misc.o nullfe.o random.o \
-                tents3.o  $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)towers: drawing.o gtk.o latin.o malloc.o maxflow.o midend.o \
-                misc.o no-icon.o printing.o ps.o random.o towers.o tree234.o \
-                version.o
-        $(CC) -o $@ drawing.o gtk.o latin.o malloc.o maxflow.o midend.o \
-                misc.o no-icon.o printing.o ps.o random.o towers.o tree234.o \
-                version.o  $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)towerssolver: latin6.o malloc.o maxflow.o misc.o nullfe.o \
-                random.o towers2.o tree234.o
-        $(CC) -o $@ latin6.o malloc.o maxflow.o misc.o nullfe.o random.o \
-                towers2.o tree234.o  $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)tracks: drawing.o dsf.o findloop.o gtk.o malloc.o midend.o \
-                misc.o no-icon.o printing.o ps.o random.o tracks.o version.o
-        $(CC) -o $@ drawing.o dsf.o findloop.o gtk.o malloc.o midend.o \
-                misc.o no-icon.o printing.o ps.o random.o tracks.o version.o \
-                 $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)twiddle: drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o twiddle.o version.o
-        $(CC) -o $@ drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o twiddle.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)undead: drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o undead.o version.o
-        $(CC) -o $@ drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o undead.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)unequal: drawing.o gtk.o latin.o malloc.o maxflow.o midend.o \
-                misc.o no-icon.o printing.o ps.o random.o tree234.o \
-                unequal.o version.o
-        $(CC) -o $@ drawing.o gtk.o latin.o malloc.o maxflow.o midend.o \
-                misc.o no-icon.o printing.o ps.o random.o tree234.o \
-                unequal.o version.o  $(XLFLAGS) $(XLIBS)
-
-$(BINPREFIX)unequalsolver: latin6.o malloc.o maxflow.o misc.o nullfe.o \
-                random.o tree234.o unequal2.o
-        $(CC) -o $@ latin6.o malloc.o maxflow.o misc.o nullfe.o random.o \
-                tree234.o unequal2.o  $(XLFLAGS) $(ULIBS)
-
-$(BINPREFIX)unruly: drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o unruly.o version.o
-        $(CC) -o $@ drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o unruly.o version.o  $(XLFLAGS) \
-                $(XLIBS)
-
-$(BINPREFIX)unrulysolver: malloc.o misc.o nullfe.o random.o unruly2.o
-        $(CC) -o $@ malloc.o misc.o nullfe.o random.o unruly2.o  $(XLFLAGS) \
-                $(ULIBS)
-
-$(BINPREFIX)untangle: drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o tree234.o untangle.o version.o
-        $(CC) -o $@ drawing.o gtk.o malloc.o midend.o misc.o no-icon.o \
-                printing.o ps.o random.o tree234.o untangle.o version.o  \
-                $(XLFLAGS) $(XLIBS)
-
-blackbox.o: ./blackbox.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-blackbo3.o: ./blackbox.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-bridges.o: ./bridges.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-bridges3.o: ./bridges.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-combi.o: ./combi.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-cube.o: ./cube.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-cube3.o: ./cube.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-divvy.o: ./divvy.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-dominosa.o: ./dominosa.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-dominos3.o: ./dominosa.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-drawing.o: ./drawing.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-dsf.o: ./dsf.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-fifteen.o: ./fifteen.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-fifteen5.o: ./fifteen.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-fifteen2.o: ./fifteen.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-filling.o: ./filling.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-filling5.o: ./filling.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-filling2.o: ./filling.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-findloop.o: ./findloop.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-flip.o: ./flip.c ./puzzles.h ./tree234.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-flip3.o: ./flip.c ./puzzles.h ./tree234.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-flood.o: ./flood.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-flood3.o: ./flood.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-galaxies.o: ./galaxies.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-galaxie7.o: ./galaxies.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-galaxie4.o: ./galaxies.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_PICTURE_GENERATOR -c $< -o $@
-galaxie2.o: ./galaxies.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-grid.o: ./grid.c ./puzzles.h ./tree234.h ./grid.h ./penrose.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-gtk.o: ./gtk.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-guess.o: ./guess.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-guess3.o: ./guess.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-inertia.o: ./inertia.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-inertia3.o: ./inertia.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-keen.o: ./keen.c ./puzzles.h ./latin.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-keen5.o: ./keen.c ./puzzles.h ./latin.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-keen2.o: ./keen.c ./puzzles.h ./latin.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-latin.o: ./latin.c ./puzzles.h ./tree234.h ./maxflow.h ./latin.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-latin8.o: ./latin.c ./puzzles.h ./tree234.h ./maxflow.h ./latin.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_LATIN_TEST -c $< -o $@
-latin6.o: ./latin.c ./puzzles.h ./tree234.h ./maxflow.h ./latin.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-laydomino.o: ./laydomino.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-lightup.o: ./lightup.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-lightup5.o: ./lightup.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-lightup2.o: ./lightup.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-list.o: ./list.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-loopgen.o: ./loopgen.c ./puzzles.h ./tree234.h ./grid.h ./loopgen.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-loopy.o: ./loopy.c ./puzzles.h ./tree234.h ./grid.h ./loopgen.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-loopy5.o: ./loopy.c ./puzzles.h ./tree234.h ./grid.h ./loopgen.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-loopy2.o: ./loopy.c ./puzzles.h ./tree234.h ./grid.h ./loopgen.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-magnets.o: ./magnets.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-magnets5.o: ./magnets.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-magnets2.o: ./magnets.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-malloc.o: ./malloc.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-map.o: ./map.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-map5.o: ./map.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-map2.o: ./map.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-maxflow.o: ./maxflow.c ./maxflow.h ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-midend.o: ./midend.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-mines.o: ./mines.c ./tree234.h ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-mines5.o: ./mines.c ./tree234.h ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-mines2.o: ./mines.c ./tree234.h ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_OBFUSCATOR -c $< -o $@
-misc.o: ./misc.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-net.o: ./net.c ./puzzles.h ./tree234.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-net3.o: ./net.c ./puzzles.h ./tree234.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-netslide.o: ./netslide.c ./puzzles.h ./tree234.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-netslid3.o: ./netslide.c ./puzzles.h ./tree234.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-no-icon.o: ./no-icon.c
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-nullfe.o: ./nullfe.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-nullgame.o: ./nullgame.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-obfusc.o: ./obfusc.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-osx.o: ./osx.m ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-palisade.o: ./palisade.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-palisad3.o: ./palisade.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-pattern.o: ./pattern.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-pattern7.o: ./pattern.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-pattern4.o: ./pattern.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_PICTURE_GENERATOR -c $< -o $@
-pattern2.o: ./pattern.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-pearl.o: ./pearl.c ./puzzles.h ./grid.h ./loopgen.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-pearl5.o: ./pearl.c ./puzzles.h ./grid.h ./loopgen.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-pearl2.o: ./pearl.c ./puzzles.h ./grid.h ./loopgen.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-pegs.o: ./pegs.c ./puzzles.h ./tree234.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-pegs3.o: ./pegs.c ./puzzles.h ./tree234.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-penrose.o: ./penrose.c ./puzzles.h ./penrose.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-printing.o: ./printing.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-ps.o: ./ps.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-random.o: ./random.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-range.o: ./range.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-range3.o: ./range.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-rect.o: ./rect.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-rect3.o: ./rect.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-samegame.o: ./samegame.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-samegam3.o: ./samegame.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-signpost.o: ./signpost.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-signpos5.o: ./signpost.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-signpos2.o: ./signpost.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-singles.o: ./singles.c ./puzzles.h ./latin.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-singles5.o: ./singles.c ./puzzles.h ./latin.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-singles3.o: ./singles.c ./puzzles.h ./latin.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-sixteen.o: ./sixteen.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-sixteen3.o: ./sixteen.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-slant.o: ./slant.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-slant5.o: ./slant.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-slant2.o: ./slant.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-solo.o: ./solo.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-solo5.o: ./solo.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-solo2.o: ./solo.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-tdq.o: ./tdq.c ./puzzles.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-tents.o: ./tents.c ./puzzles.h ./maxflow.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-tents5.o: ./tents.c ./puzzles.h ./maxflow.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-tents3.o: ./tents.c ./puzzles.h ./maxflow.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DSTANDALONE_SOLVER -c $< -o $@
-towers.o: ./towers.c ./puzzles.h ./latin.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-towers5.o: ./towers.c ./puzzles.h ./latin.h
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-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
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-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
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-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
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-unruly5.o: ./unruly.c ./puzzles.h
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-untangle.o: ./untangle.c ./puzzles.h ./tree234.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-untangl3.o: ./untangle.c ./puzzles.h ./tree234.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
-version.o: ./version.c ./version.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-windows.o: ./windows.c ./puzzles.h ./resource.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -c $< -o $@
-windows1.o: ./windows.c ./puzzles.h ./resource.h
-        $(CC) $(COMPAT) $(FWHACK) $(CFLAGS) $(XFLAGS) -DCOMBINED -c $< -o $@
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-GAMES += guess
-GAMES += inertia
-GAMES += keen
-GAMES += lightup
-GAMES += loopy
-GAMES += magnets
-GAMES += map
-GAMES += mines
-GAMES += net
-GAMES += netslide
-GAMES += palisade
-GAMES += pattern
-GAMES += pearl
-GAMES += pegs
-GAMES += range
-GAMES += rect
-GAMES += samegame
-GAMES += signpost
-GAMES += singles
-GAMES += sixteen
-GAMES += slant
-GAMES += solo
-GAMES += tents
-GAMES += towers
-GAMES += tracks
-GAMES += twiddle
-GAMES += undead
-GAMES += unequal
-GAMES += unruly
-GAMES += untangle
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-                || exit 1; \
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+        galaxies guess inertia keen lightup loopy magnets map mines \
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+        signpost singles sixteen slant solo tents towers tracks \
+        twiddle undead unequal unruly untangle
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+                ./findloop.c ./flip.c ./flood.c ./galaxies.c ./grid.c \
+                ./grid.h ./gtk.c ./guess.c ./inertia.c ./keen.c ./latin.c \
+                ./latin.h ./laydomino.c ./lightup.c ./list.c ./loopgen.c \
+                ./loopgen.h ./loopy.c ./magnets.c ./malloc.c ./map.c \
+                ./maxflow.c ./maxflow.h ./midend.c ./mines.c ./misc.c \
+                ./net.c ./netslide.c ./no-icon.c ./nullfe.c ./nullgame.c \
+                ./obfusc.c ./osx.m ./palisade.c ./pattern.c ./pearl.c \
+                ./pegs.c ./penrose.c ./penrose.h ./printing.c ./ps.c \
+                ./puzzles.h ./random.c ./range.c ./rect.c ./resource.h \
+                ./samegame.c ./signpost.c ./singles.c ./sixteen.c ./slant.c \
+                ./solo.c ./tdq.c ./tents.c ./towers.c ./tracks.c ./tree234.c \
+                ./tree234.h ./twiddle.c ./undead.c ./unequal.c ./unruly.c \
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+                ./random.c ./version.c ./version.h
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+blackbox_LDADD = $(GTK_LIBS) -lm
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+                ./malloc.c ./midend.c ./misc.c ./no-icon.c ./printing.c \
+                ./ps.c ./puzzles.h ./random.c ./version.c ./version.h
+
+bridges_LDADD = $(GTK_LIBS) -lm
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+                ./no-icon.c ./printing.c ./ps.c ./puzzles.h ./random.c \
+                ./version.c ./version.h
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+cube_LDADD = $(GTK_LIBS) -lm
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+                ./midend.c ./misc.c ./no-icon.c ./printing.c ./ps.c \
+                ./puzzles.h ./random.c ./version.c ./version.h
+
+dominosa_LDADD = $(GTK_LIBS) -lm
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+                ./misc.c ./no-icon.c ./printing.c ./ps.c ./puzzles.h \
+                ./random.c ./version.c ./version.h
+
+fifteen_LDADD = $(GTK_LIBS) -lm
+fifteensolver_SOURCES = ./malloc.c ./misc.c ./nullfe.c ./puzzles.h \
+                ./random.c
+
+fifteensolver_LDADD = libfifteen2_a-fifteen.$(OBJEXT) -lm
+filling_SOURCES = ./drawing.c ./dsf.c ./filling.c ./gtk.c ./malloc.c \
+                ./midend.c ./misc.c ./no-icon.c ./printing.c ./ps.c \
+                ./puzzles.h ./random.c ./version.c ./version.h
+
+filling_LDADD = $(GTK_LIBS) -lm
+fillingsolver_SOURCES = ./dsf.c ./malloc.c ./misc.c ./nullfe.c ./puzzles.h \
+                ./random.c
+
+fillingsolver_LDADD = libfilling2_a-filling.$(OBJEXT) -lm
+flip_SOURCES = ./drawing.c ./flip.c ./gtk.c ./malloc.c ./midend.c ./misc.c \
+                ./no-icon.c ./printing.c ./ps.c ./puzzles.h ./random.c \
+                ./tree234.c ./tree234.h ./version.c ./version.h
+
+flip_LDADD = $(GTK_LIBS) -lm
+flood_SOURCES = ./drawing.c ./flood.c ./gtk.c ./malloc.c ./midend.c ./misc.c \
+                ./no-icon.c ./printing.c ./ps.c ./puzzles.h ./random.c \
+                ./version.c ./version.h
+
+flood_LDADD = $(GTK_LIBS) -lm
+galaxies_SOURCES = ./drawing.c ./dsf.c ./galaxies.c ./gtk.c ./malloc.c \
+                ./midend.c ./misc.c ./no-icon.c ./printing.c ./ps.c \
+                ./puzzles.h ./random.c ./version.c ./version.h
+
+galaxies_LDADD = $(GTK_LIBS) -lm
+galaxiespicture_SOURCES = ./dsf.c ./malloc.c ./misc.c ./nullfe.c ./puzzles.h \
+                ./random.c
+
+galaxiespicture_LDADD = libgalaxie4_a-galaxies.$(OBJEXT) -lm
+galaxiessolver_SOURCES = ./dsf.c ./malloc.c ./misc.c ./nullfe.c ./puzzles.h \
+                ./random.c
+
+galaxiessolver_LDADD = libgalaxie2_a-galaxies.$(OBJEXT) -lm
+guess_SOURCES = ./drawing.c ./gtk.c ./guess.c ./malloc.c ./midend.c ./misc.c \
+                ./no-icon.c ./printing.c ./ps.c ./puzzles.h ./random.c \
+                ./version.c ./version.h
+
+guess_LDADD = $(GTK_LIBS) -lm
+inertia_SOURCES = ./drawing.c ./gtk.c ./inertia.c ./malloc.c ./midend.c \
+                ./misc.c ./no-icon.c ./printing.c ./ps.c ./puzzles.h \
+                ./random.c ./version.c ./version.h
+
+inertia_LDADD = $(GTK_LIBS) -lm
+keen_SOURCES = ./drawing.c ./dsf.c ./gtk.c ./keen.c ./latin.c ./latin.h \
+                ./malloc.c ./maxflow.c ./maxflow.h ./midend.c ./misc.c \
+                ./no-icon.c ./printing.c ./ps.c ./puzzles.h ./random.c \
+                ./tree234.c ./tree234.h ./version.c ./version.h
+
+keen_LDADD = $(GTK_LIBS) -lm
+keensolver_SOURCES = ./dsf.c ./malloc.c ./maxflow.c ./maxflow.h ./misc.c \
+                ./nullfe.c ./puzzles.h ./random.c ./tree234.c ./tree234.h
+
+keensolver_LDADD = libkeen2_a-keen.$(OBJEXT) liblatin6_a-latin.$(OBJEXT) -lm
+latincheck_SOURCES = ./malloc.c ./maxflow.c ./maxflow.h ./misc.c ./nullfe.c \
+                ./puzzles.h ./random.c ./tree234.c ./tree234.h
+
+latincheck_LDADD = liblatin8_a-latin.$(OBJEXT) -lm
+lightup_SOURCES = ./combi.c ./drawing.c ./gtk.c ./lightup.c ./malloc.c \
+                ./midend.c ./misc.c ./no-icon.c ./printing.c ./ps.c \
+                ./puzzles.h ./random.c ./version.c ./version.h
+
+lightup_LDADD = $(GTK_LIBS) -lm
+lightupsolver_SOURCES = ./combi.c ./malloc.c ./misc.c ./nullfe.c ./puzzles.h \
+                ./random.c
+
+lightupsolver_LDADD = liblightup2_a-lightup.$(OBJEXT) -lm
+loopy_SOURCES = ./drawing.c ./dsf.c ./grid.c ./grid.h ./gtk.c ./loopgen.c \
+                ./loopgen.h ./loopy.c ./malloc.c ./midend.c ./misc.c \
+                ./no-icon.c ./penrose.c ./penrose.h ./printing.c ./ps.c \
+                ./puzzles.h ./random.c ./tree234.c ./tree234.h ./version.c \
+                ./version.h
+
+loopy_LDADD = $(GTK_LIBS) -lm
+loopysolver_SOURCES = ./dsf.c ./grid.c ./grid.h ./loopgen.c ./loopgen.h \
+                ./malloc.c ./misc.c ./nullfe.c ./penrose.c ./penrose.h \
+                ./puzzles.h ./random.c ./tree234.c ./tree234.h
+
+loopysolver_LDADD = libloopy2_a-loopy.$(OBJEXT) -lm
+magnets_SOURCES = ./drawing.c ./gtk.c ./laydomino.c ./magnets.c ./malloc.c \
+                ./midend.c ./misc.c ./no-icon.c ./printing.c ./ps.c \
+                ./puzzles.h ./random.c ./version.c ./version.h
+
+magnets_LDADD = $(GTK_LIBS) -lm
+magnetssolver_SOURCES = ./laydomino.c ./malloc.c ./misc.c ./nullfe.c \
+                ./puzzles.h ./random.c
+
+magnetssolver_LDADD = libmagnets2_a-magnets.$(OBJEXT) -lm
+map_SOURCES = ./drawing.c ./dsf.c ./gtk.c ./malloc.c ./map.c ./midend.c \
+                ./misc.c ./no-icon.c ./printing.c ./ps.c ./puzzles.h \
+                ./random.c ./version.c ./version.h
+
+map_LDADD = $(GTK_LIBS) -lm
+mapsolver_SOURCES = ./dsf.c ./malloc.c ./misc.c ./nullfe.c ./puzzles.h \
+                ./random.c
+
+mapsolver_LDADD = libmap2_a-map.$(OBJEXT) -lm
+mineobfusc_SOURCES = ./malloc.c ./misc.c ./nullfe.c ./puzzles.h ./random.c \
+                ./tree234.c ./tree234.h
+
+mineobfusc_LDADD = libmines2_a-mines.$(OBJEXT) -lm
+mines_SOURCES = ./drawing.c ./gtk.c ./malloc.c ./midend.c ./mines.c ./misc.c \
+                ./no-icon.c ./printing.c ./ps.c ./puzzles.h ./random.c \
+                ./tree234.c ./tree234.h ./version.c ./version.h
+
+mines_LDADD = $(GTK_LIBS) -lm
+net_SOURCES = ./drawing.c ./dsf.c ./findloop.c ./gtk.c ./malloc.c ./midend.c \
+                ./misc.c ./net.c ./no-icon.c ./printing.c ./ps.c ./puzzles.h \
+                ./random.c ./tree234.c ./tree234.h ./version.c ./version.h
+
+net_LDADD = $(GTK_LIBS) -lm
+netslide_SOURCES = ./drawing.c ./gtk.c ./malloc.c ./midend.c ./misc.c \
+                ./netslide.c ./no-icon.c ./printing.c ./ps.c ./puzzles.h \
+                ./random.c ./tree234.c ./tree234.h ./version.c ./version.h
+
+netslide_LDADD = $(GTK_LIBS) -lm
+nullgame_SOURCES = ./drawing.c ./gtk.c ./malloc.c ./midend.c ./misc.c \
+                ./no-icon.c ./nullgame.c ./printing.c ./ps.c ./puzzles.h \
+                ./random.c ./version.c ./version.h
+
+nullgame_LDADD = $(GTK_LIBS) -lm
+obfusc_SOURCES = ./malloc.c ./misc.c ./nullfe.c ./obfusc.c ./puzzles.h \
+                ./random.c
+
+obfusc_LDADD = -lm
+palisade_SOURCES = ./divvy.c ./drawing.c ./dsf.c ./gtk.c ./malloc.c \
+                ./midend.c ./misc.c ./no-icon.c ./palisade.c ./printing.c \
+                ./ps.c ./puzzles.h ./random.c ./version.c ./version.h
+
+palisade_LDADD = $(GTK_LIBS) -lm
+pattern_SOURCES = ./drawing.c ./gtk.c ./malloc.c ./midend.c ./misc.c \
+                ./no-icon.c ./pattern.c ./printing.c ./ps.c ./puzzles.h \
+                ./random.c ./version.c ./version.h
+
+pattern_LDADD = $(GTK_LIBS) -lm
+patternpicture_SOURCES = ./malloc.c ./misc.c ./nullfe.c ./puzzles.h \
+                ./random.c
+
+patternpicture_LDADD = libpattern4_a-pattern.$(OBJEXT) -lm
+patternsolver_SOURCES = ./malloc.c ./misc.c ./nullfe.c ./puzzles.h \
+                ./random.c
+
+patternsolver_LDADD = libpattern2_a-pattern.$(OBJEXT) -lm
+pearl_SOURCES = ./drawing.c ./dsf.c ./grid.c ./grid.h ./gtk.c ./loopgen.c \
+                ./loopgen.h ./malloc.c ./midend.c ./misc.c ./no-icon.c \
+                ./pearl.c ./penrose.c ./penrose.h ./printing.c ./ps.c \
+                ./puzzles.h ./random.c ./tdq.c ./tree234.c ./tree234.h \
+                ./version.c ./version.h
+
+pearl_LDADD = $(GTK_LIBS) -lm
+pearlbench_SOURCES = ./dsf.c ./grid.c ./grid.h ./loopgen.c ./loopgen.h \
+                ./malloc.c ./misc.c ./nullfe.c ./penrose.c ./penrose.h \
+                ./puzzles.h ./random.c ./tdq.c ./tree234.c ./tree234.h
+
+pearlbench_LDADD = libpearl2_a-pearl.$(OBJEXT) -lm
+pegs_SOURCES = ./drawing.c ./gtk.c ./malloc.c ./midend.c ./misc.c \
+                ./no-icon.c ./pegs.c ./printing.c ./ps.c ./puzzles.h \
+                ./random.c ./tree234.c ./tree234.h ./version.c ./version.h
+
+pegs_LDADD = $(GTK_LIBS) -lm
+range_SOURCES = ./drawing.c ./dsf.c ./gtk.c ./malloc.c ./midend.c ./misc.c \
+                ./no-icon.c ./printing.c ./ps.c ./puzzles.h ./random.c \
+                ./range.c ./version.c ./version.h
+
+range_LDADD = $(GTK_LIBS) -lm
+rect_SOURCES = ./drawing.c ./gtk.c ./malloc.c ./midend.c ./misc.c \
+                ./no-icon.c ./printing.c ./ps.c ./puzzles.h ./random.c \
+                ./rect.c ./version.c ./version.h
+
+rect_LDADD = $(GTK_LIBS) -lm
+samegame_SOURCES = ./drawing.c ./gtk.c ./malloc.c ./midend.c ./misc.c \
+                ./no-icon.c ./printing.c ./ps.c ./puzzles.h ./random.c \
+                ./samegame.c ./version.c ./version.h
+
+samegame_LDADD = $(GTK_LIBS) -lm
+signpost_SOURCES = ./drawing.c ./dsf.c ./gtk.c ./malloc.c ./midend.c \
+                ./misc.c ./no-icon.c ./printing.c ./ps.c ./puzzles.h \
+                ./random.c ./signpost.c ./version.c ./version.h
+
+signpost_LDADD = $(GTK_LIBS) -lm
+signpostsolver_SOURCES = ./dsf.c ./malloc.c ./misc.c ./nullfe.c ./puzzles.h \
+                ./random.c
+
+signpostsolver_LDADD = libsignpos2_a-signpost.$(OBJEXT) -lm
+singles_SOURCES = ./drawing.c ./dsf.c ./gtk.c ./latin.c ./latin.h ./malloc.c \
+                ./maxflow.c ./maxflow.h ./midend.c ./misc.c ./no-icon.c \
+                ./printing.c ./ps.c ./puzzles.h ./random.c ./singles.c \
+                ./tree234.c ./tree234.h ./version.c ./version.h
+
+singles_LDADD = $(GTK_LIBS) -lm
+singlessolver_SOURCES = ./dsf.c ./latin.c ./latin.h ./malloc.c ./maxflow.c \
+                ./maxflow.h ./misc.c ./nullfe.c ./puzzles.h ./random.c \
+                ./tree234.c ./tree234.h
+
+singlessolver_LDADD = libsingles3_a-singles.$(OBJEXT) -lm
+sixteen_SOURCES = ./drawing.c ./gtk.c ./malloc.c ./midend.c ./misc.c \
+                ./no-icon.c ./printing.c ./ps.c ./puzzles.h ./random.c \
+                ./sixteen.c ./version.c ./version.h
+
+sixteen_LDADD = $(GTK_LIBS) -lm
+slant_SOURCES = ./drawing.c ./dsf.c ./findloop.c ./gtk.c ./malloc.c \
+                ./midend.c ./misc.c ./no-icon.c ./printing.c ./ps.c \
+                ./puzzles.h ./random.c ./slant.c ./version.c ./version.h
+
+slant_LDADD = $(GTK_LIBS) -lm
+slantsolver_SOURCES = ./dsf.c ./findloop.c ./malloc.c ./misc.c ./nullfe.c \
+                ./puzzles.h ./random.c
+
+slantsolver_LDADD = libslant2_a-slant.$(OBJEXT) -lm
+solo_SOURCES = ./divvy.c ./drawing.c ./dsf.c ./gtk.c ./malloc.c ./midend.c \
+                ./misc.c ./no-icon.c ./printing.c ./ps.c ./puzzles.h \
+                ./random.c ./solo.c ./version.c ./version.h
+
+solo_LDADD = $(GTK_LIBS) -lm
+solosolver_SOURCES = ./divvy.c ./dsf.c ./malloc.c ./misc.c ./nullfe.c \
+                ./puzzles.h ./random.c
+
+solosolver_LDADD = libsolo2_a-solo.$(OBJEXT) -lm
+tents_SOURCES = ./drawing.c ./dsf.c ./gtk.c ./malloc.c ./maxflow.c \
+                ./maxflow.h ./midend.c ./misc.c ./no-icon.c ./printing.c \
+                ./ps.c ./puzzles.h ./random.c ./tents.c ./version.c \
+                ./version.h
+
+tents_LDADD = $(GTK_LIBS) -lm
+tentssolver_SOURCES = ./dsf.c ./malloc.c ./maxflow.c ./maxflow.h ./misc.c \
+                ./nullfe.c ./puzzles.h ./random.c
+
+tentssolver_LDADD = libtents3_a-tents.$(OBJEXT) -lm
+towers_SOURCES = ./drawing.c ./gtk.c ./latin.c ./latin.h ./malloc.c \
+                ./maxflow.c ./maxflow.h ./midend.c ./misc.c ./no-icon.c \
+                ./printing.c ./ps.c ./puzzles.h ./random.c ./towers.c \
+                ./tree234.c ./tree234.h ./version.c ./version.h
+
+towers_LDADD = $(GTK_LIBS) -lm
+towerssolver_SOURCES = ./malloc.c ./maxflow.c ./maxflow.h ./misc.c \
+                ./nullfe.c ./puzzles.h ./random.c ./tree234.c ./tree234.h
+
+towerssolver_LDADD = liblatin6_a-latin.$(OBJEXT) \
+                libtowers2_a-towers.$(OBJEXT) -lm
+
+tracks_SOURCES = ./drawing.c ./dsf.c ./findloop.c ./gtk.c ./malloc.c \
+                ./midend.c ./misc.c ./no-icon.c ./printing.c ./ps.c \
+                ./puzzles.h ./random.c ./tracks.c ./version.c ./version.h
+
+tracks_LDADD = $(GTK_LIBS) -lm
+twiddle_SOURCES = ./drawing.c ./gtk.c ./malloc.c ./midend.c ./misc.c \
+                ./no-icon.c ./printing.c ./ps.c ./puzzles.h ./random.c \
+                ./twiddle.c ./version.c ./version.h
+
+twiddle_LDADD = $(GTK_LIBS) -lm
+undead_SOURCES = ./drawing.c ./gtk.c ./malloc.c ./midend.c ./misc.c \
+                ./no-icon.c ./printing.c ./ps.c ./puzzles.h ./random.c \
+                ./undead.c ./version.c ./version.h
+
+undead_LDADD = $(GTK_LIBS) -lm
+unequal_SOURCES = ./drawing.c ./gtk.c ./latin.c ./latin.h ./malloc.c \
+                ./maxflow.c ./maxflow.h ./midend.c ./misc.c ./no-icon.c \
+                ./printing.c ./ps.c ./puzzles.h ./random.c ./tree234.c \
+                ./tree234.h ./unequal.c ./version.c ./version.h
+
+unequal_LDADD = $(GTK_LIBS) -lm
+unequalsolver_SOURCES = ./malloc.c ./maxflow.c ./maxflow.h ./misc.c \
+                ./nullfe.c ./puzzles.h ./random.c ./tree234.c ./tree234.h
+
+unequalsolver_LDADD = liblatin6_a-latin.$(OBJEXT) \
+                libunequal2_a-unequal.$(OBJEXT) -lm
+
+unruly_SOURCES = ./drawing.c ./gtk.c ./malloc.c ./midend.c ./misc.c \
+                ./no-icon.c ./printing.c ./ps.c ./puzzles.h ./random.c \
+                ./unruly.c ./version.c ./version.h
+
+unruly_LDADD = $(GTK_LIBS) -lm
+unrulysolver_SOURCES = ./malloc.c ./misc.c ./nullfe.c ./puzzles.h ./random.c
+unrulysolver_LDADD = libunruly2_a-unruly.$(OBJEXT) -lm
+untangle_SOURCES = ./drawing.c ./gtk.c ./malloc.c ./midend.c ./misc.c \
+                ./no-icon.c ./printing.c ./ps.c ./puzzles.h ./random.c \
+                ./tree234.c ./tree234.h ./untangle.c ./version.c ./version.h
+
+untangle_LDADD = $(GTK_LIBS) -lm
+libfifteen2_a_SOURCES = ./fifteen.c ./puzzles.h
+libfifteen2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libfilling2_a_SOURCES = ./filling.c ./puzzles.h
+libfilling2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libgalaxie2_a_SOURCES = ./galaxies.c ./puzzles.h
+libgalaxie2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libgalaxie4_a_SOURCES = ./galaxies.c ./puzzles.h
+libgalaxie4_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  \
+                -DSTANDALONE_PICTURE_GENERATOR
+
+libkeen2_a_SOURCES = ./keen.c ./puzzles.h ./latin.h
+libkeen2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+liblatin6_a_SOURCES = ./latin.c ./puzzles.h ./tree234.h ./maxflow.h \
+                ./latin.h
+
+liblatin6_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+liblatin8_a_SOURCES = ./latin.c ./puzzles.h ./tree234.h ./maxflow.h \
+                ./latin.h
+
+liblatin8_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_LATIN_TEST
+liblightup2_a_SOURCES = ./lightup.c ./puzzles.h
+liblightup2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libloopy2_a_SOURCES = ./loopy.c ./puzzles.h ./tree234.h ./grid.h ./loopgen.h
+libloopy2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libmagnets2_a_SOURCES = ./magnets.c ./puzzles.h
+libmagnets2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libmap2_a_SOURCES = ./map.c ./puzzles.h
+libmap2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libmines2_a_SOURCES = ./mines.c ./tree234.h ./puzzles.h
+libmines2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_OBFUSCATOR
+libpattern2_a_SOURCES = ./pattern.c ./puzzles.h
+libpattern2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libpattern4_a_SOURCES = ./pattern.c ./puzzles.h
+libpattern4_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  \
+                -DSTANDALONE_PICTURE_GENERATOR
+
+libpearl2_a_SOURCES = ./pearl.c ./puzzles.h ./grid.h ./loopgen.h
+libpearl2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libsignpos2_a_SOURCES = ./signpost.c ./puzzles.h
+libsignpos2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libsingles3_a_SOURCES = ./singles.c ./puzzles.h ./latin.h
+libsingles3_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libslant2_a_SOURCES = ./slant.c ./puzzles.h
+libslant2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libsolo2_a_SOURCES = ./solo.c ./puzzles.h
+libsolo2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libtents3_a_SOURCES = ./tents.c ./puzzles.h ./maxflow.h
+libtents3_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libtowers2_a_SOURCES = ./towers.c ./puzzles.h ./latin.h
+libtowers2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libunequal2_a_SOURCES = ./unequal.c ./puzzles.h ./latin.h
+libunequal2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+libunruly2_a_SOURCES = ./unruly.c ./puzzles.h
+libunruly2_a_CPPFLAGS = $(GTK_CFLAGS) $(WARNINGOPTS)  -DSTANDALONE_SOLVER
+noinst_LIBRARIES = libfifteen2.a libfilling2.a libgalaxie2.a libgalaxie4.a \
+                libkeen2.a liblatin6.a liblatin8.a liblightup2.a libloopy2.a \
+                libmagnets2.a libmap2.a libmines2.a libpattern2.a \
+                libpattern4.a libpearl2.a libsignpos2.a libsingles3.a \
+                libslant2.a libsolo2.a libtents3.a libtowers2.a \
+                libunequal2.a libunruly2.a
+
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .o .obj
+am--refresh: Makefile
+        @:
+$(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
+        @for dep in $?; do \
+          case '$(am__configure_deps)' in \
+            *$$dep*) \
+              echo ' cd $(srcdir) && $(AUTOMAKE) --foreign'; \
+              $(am__cd) $(srcdir) && $(AUTOMAKE) --foreign \
+                && exit 0; \
+              exit 1;; \
+          esac; \
+        done; \
+        echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign Makefile'; \
+        $(am__cd) $(top_srcdir) && \
+          $(AUTOMAKE) --foreign Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+        @case '$?' in \
+          *config.status*) \
+            echo ' $(SHELL) ./config.status'; \
+            $(SHELL) ./config.status;; \
+          *) \
+            echo ' cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__depfiles_maybe)'; \
+            cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__depfiles_maybe);; \
+        esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+        $(SHELL) ./config.status --recheck
+
+$(top_srcdir)/configure:  $(am__configure_deps)
+        $(am__cd) $(srcdir) && $(AUTOCONF)
+$(ACLOCAL_M4):  $(am__aclocal_m4_deps)
+        $(am__cd) $(srcdir) && $(ACLOCAL) $(ACLOCAL_AMFLAGS)
+$(am__aclocal_m4_deps):
+
+clean-noinstLIBRARIES:
+        -test -z "$(noinst_LIBRARIES)" || rm -f $(noinst_LIBRARIES)
+./$(am__dirstamp):
+        @$(MKDIR_P) .
+        @: > ./$(am__dirstamp)
+$(DEPDIR)/$(am__dirstamp):
+        @$(MKDIR_P) ./$(DEPDIR)
+        @: > $(DEPDIR)/$(am__dirstamp)
+./libfifteen2_a-fifteen.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libfifteen2.a: $(libfifteen2_a_OBJECTS) $(libfifteen2_a_DEPENDENCIES) $(EXTRA_libfifteen2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libfifteen2.a
+        $(AM_V_AR)$(libfifteen2_a_AR) libfifteen2.a $(libfifteen2_a_OBJECTS) $(libfifteen2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libfifteen2.a
+./libfilling2_a-filling.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libfilling2.a: $(libfilling2_a_OBJECTS) $(libfilling2_a_DEPENDENCIES) $(EXTRA_libfilling2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libfilling2.a
+        $(AM_V_AR)$(libfilling2_a_AR) libfilling2.a $(libfilling2_a_OBJECTS) $(libfilling2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libfilling2.a
+./libgalaxie2_a-galaxies.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libgalaxie2.a: $(libgalaxie2_a_OBJECTS) $(libgalaxie2_a_DEPENDENCIES) $(EXTRA_libgalaxie2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libgalaxie2.a
+        $(AM_V_AR)$(libgalaxie2_a_AR) libgalaxie2.a $(libgalaxie2_a_OBJECTS) $(libgalaxie2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libgalaxie2.a
+./libgalaxie4_a-galaxies.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libgalaxie4.a: $(libgalaxie4_a_OBJECTS) $(libgalaxie4_a_DEPENDENCIES) $(EXTRA_libgalaxie4_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libgalaxie4.a
+        $(AM_V_AR)$(libgalaxie4_a_AR) libgalaxie4.a $(libgalaxie4_a_OBJECTS) $(libgalaxie4_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libgalaxie4.a
+./libkeen2_a-keen.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libkeen2.a: $(libkeen2_a_OBJECTS) $(libkeen2_a_DEPENDENCIES) $(EXTRA_libkeen2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libkeen2.a
+        $(AM_V_AR)$(libkeen2_a_AR) libkeen2.a $(libkeen2_a_OBJECTS) $(libkeen2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libkeen2.a
+./liblatin6_a-latin.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+liblatin6.a: $(liblatin6_a_OBJECTS) $(liblatin6_a_DEPENDENCIES) $(EXTRA_liblatin6_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f liblatin6.a
+        $(AM_V_AR)$(liblatin6_a_AR) liblatin6.a $(liblatin6_a_OBJECTS) $(liblatin6_a_LIBADD)
+        $(AM_V_at)$(RANLIB) liblatin6.a
+./liblatin8_a-latin.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+liblatin8.a: $(liblatin8_a_OBJECTS) $(liblatin8_a_DEPENDENCIES) $(EXTRA_liblatin8_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f liblatin8.a
+        $(AM_V_AR)$(liblatin8_a_AR) liblatin8.a $(liblatin8_a_OBJECTS) $(liblatin8_a_LIBADD)
+        $(AM_V_at)$(RANLIB) liblatin8.a
+./liblightup2_a-lightup.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+liblightup2.a: $(liblightup2_a_OBJECTS) $(liblightup2_a_DEPENDENCIES) $(EXTRA_liblightup2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f liblightup2.a
+        $(AM_V_AR)$(liblightup2_a_AR) liblightup2.a $(liblightup2_a_OBJECTS) $(liblightup2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) liblightup2.a
+./libloopy2_a-loopy.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libloopy2.a: $(libloopy2_a_OBJECTS) $(libloopy2_a_DEPENDENCIES) $(EXTRA_libloopy2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libloopy2.a
+        $(AM_V_AR)$(libloopy2_a_AR) libloopy2.a $(libloopy2_a_OBJECTS) $(libloopy2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libloopy2.a
+./libmagnets2_a-magnets.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libmagnets2.a: $(libmagnets2_a_OBJECTS) $(libmagnets2_a_DEPENDENCIES) $(EXTRA_libmagnets2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libmagnets2.a
+        $(AM_V_AR)$(libmagnets2_a_AR) libmagnets2.a $(libmagnets2_a_OBJECTS) $(libmagnets2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libmagnets2.a
+./libmap2_a-map.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+libmap2.a: $(libmap2_a_OBJECTS) $(libmap2_a_DEPENDENCIES) $(EXTRA_libmap2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libmap2.a
+        $(AM_V_AR)$(libmap2_a_AR) libmap2.a $(libmap2_a_OBJECTS) $(libmap2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libmap2.a
+./libmines2_a-mines.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libmines2.a: $(libmines2_a_OBJECTS) $(libmines2_a_DEPENDENCIES) $(EXTRA_libmines2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libmines2.a
+        $(AM_V_AR)$(libmines2_a_AR) libmines2.a $(libmines2_a_OBJECTS) $(libmines2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libmines2.a
+./libpattern2_a-pattern.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libpattern2.a: $(libpattern2_a_OBJECTS) $(libpattern2_a_DEPENDENCIES) $(EXTRA_libpattern2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libpattern2.a
+        $(AM_V_AR)$(libpattern2_a_AR) libpattern2.a $(libpattern2_a_OBJECTS) $(libpattern2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libpattern2.a
+./libpattern4_a-pattern.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libpattern4.a: $(libpattern4_a_OBJECTS) $(libpattern4_a_DEPENDENCIES) $(EXTRA_libpattern4_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libpattern4.a
+        $(AM_V_AR)$(libpattern4_a_AR) libpattern4.a $(libpattern4_a_OBJECTS) $(libpattern4_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libpattern4.a
+./libpearl2_a-pearl.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libpearl2.a: $(libpearl2_a_OBJECTS) $(libpearl2_a_DEPENDENCIES) $(EXTRA_libpearl2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libpearl2.a
+        $(AM_V_AR)$(libpearl2_a_AR) libpearl2.a $(libpearl2_a_OBJECTS) $(libpearl2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libpearl2.a
+./libsignpos2_a-signpost.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libsignpos2.a: $(libsignpos2_a_OBJECTS) $(libsignpos2_a_DEPENDENCIES) $(EXTRA_libsignpos2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libsignpos2.a
+        $(AM_V_AR)$(libsignpos2_a_AR) libsignpos2.a $(libsignpos2_a_OBJECTS) $(libsignpos2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libsignpos2.a
+./libsingles3_a-singles.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libsingles3.a: $(libsingles3_a_OBJECTS) $(libsingles3_a_DEPENDENCIES) $(EXTRA_libsingles3_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libsingles3.a
+        $(AM_V_AR)$(libsingles3_a_AR) libsingles3.a $(libsingles3_a_OBJECTS) $(libsingles3_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libsingles3.a
+./libslant2_a-slant.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libslant2.a: $(libslant2_a_OBJECTS) $(libslant2_a_DEPENDENCIES) $(EXTRA_libslant2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libslant2.a
+        $(AM_V_AR)$(libslant2_a_AR) libslant2.a $(libslant2_a_OBJECTS) $(libslant2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libslant2.a
+./libsolo2_a-solo.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libsolo2.a: $(libsolo2_a_OBJECTS) $(libsolo2_a_DEPENDENCIES) $(EXTRA_libsolo2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libsolo2.a
+        $(AM_V_AR)$(libsolo2_a_AR) libsolo2.a $(libsolo2_a_OBJECTS) $(libsolo2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libsolo2.a
+./libtents3_a-tents.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libtents3.a: $(libtents3_a_OBJECTS) $(libtents3_a_DEPENDENCIES) $(EXTRA_libtents3_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libtents3.a
+        $(AM_V_AR)$(libtents3_a_AR) libtents3.a $(libtents3_a_OBJECTS) $(libtents3_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libtents3.a
+./libtowers2_a-towers.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libtowers2.a: $(libtowers2_a_OBJECTS) $(libtowers2_a_DEPENDENCIES) $(EXTRA_libtowers2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libtowers2.a
+        $(AM_V_AR)$(libtowers2_a_AR) libtowers2.a $(libtowers2_a_OBJECTS) $(libtowers2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libtowers2.a
+./libunequal2_a-unequal.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libunequal2.a: $(libunequal2_a_OBJECTS) $(libunequal2_a_DEPENDENCIES) $(EXTRA_libunequal2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libunequal2.a
+        $(AM_V_AR)$(libunequal2_a_AR) libunequal2.a $(libunequal2_a_OBJECTS) $(libunequal2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libunequal2.a
+./libunruly2_a-unruly.$(OBJEXT): ./$(am__dirstamp) \
+        $(DEPDIR)/$(am__dirstamp)
+
+libunruly2.a: $(libunruly2_a_OBJECTS) $(libunruly2_a_DEPENDENCIES) $(EXTRA_libunruly2_a_DEPENDENCIES) 
+        $(AM_V_at)-rm -f libunruly2.a
+        $(AM_V_AR)$(libunruly2_a_AR) libunruly2.a $(libunruly2_a_OBJECTS) $(libunruly2_a_LIBADD)
+        $(AM_V_at)$(RANLIB) libunruly2.a
+install-binPROGRAMS: $(bin_PROGRAMS)
+        @$(NORMAL_INSTALL)
+        @list='$(bin_PROGRAMS)'; test -n "$(bindir)" || list=; \
+        if test -n "$$list"; then \
+          echo " $(MKDIR_P) '$(DESTDIR)$(bindir)'"; \
+          $(MKDIR_P) "$(DESTDIR)$(bindir)" || exit 1; \
+        fi; \
+        for p in $$list; do echo "$$p $$p"; done | \
+        sed 's/$(EXEEXT)$$//' | \
+        while read p p1; do if test -f $$p \
+          ; then echo "$$p"; echo "$$p"; else :; fi; \
+        done | \
+        sed -e 'p;s,.*/,,;n;h' \
+            -e 's|.*|.|' \
+            -e 'p;x;s,.*/,,;s/$(EXEEXT)$$//;$(transform);s/$$/$(EXEEXT)/' | \
+        sed 'N;N;N;s,\n, ,g' | \
+        $(AWK) 'BEGIN { files["."] = ""; dirs["."] = 1 } \
+          { d=$$3; if (dirs[d] != 1) { print "d", d; dirs[d] = 1 } \
+            if ($$2 == $$4) files[d] = files[d] " " $$1; \
+            else { print "f", $$3 "/" $$4, $$1; } } \
+          END { for (d in files) print "f", d, files[d] }' | \
+        while read type dir files; do \
+            if test "$$dir" = .; then dir=; else dir=/$$dir; fi; \
+            test -z "$$files" || { \
+              echo " $(INSTALL_PROGRAM_ENV) $(INSTALL_PROGRAM) $$files '$(DESTDIR)$(bindir)$$dir'"; \
+              $(INSTALL_PROGRAM_ENV) $(INSTALL_PROGRAM) $$files "$(DESTDIR)$(bindir)$$dir" || exit $$?; \
+            } \
+        ; done
+
+uninstall-binPROGRAMS:
+        @$(NORMAL_UNINSTALL)
+        @list='$(bin_PROGRAMS)'; test -n "$(bindir)" || list=; \
+        files=`for p in $$list; do echo "$$p"; done | \
+          sed -e 'h;s,^.*/,,;s/$(EXEEXT)$$//;$(transform)' \
+              -e 's/$$/$(EXEEXT)/' \
+        `; \
+        test -n "$$list" || exit 0; \
+        echo " ( cd '$(DESTDIR)$(bindir)' && rm -f" $$files ")"; \
+        cd "$(DESTDIR)$(bindir)" && rm -f $$files
+
+clean-binPROGRAMS:
+        -test -z "$(bin_PROGRAMS)" || rm -f $(bin_PROGRAMS)
+
+clean-noinstPROGRAMS:
+        -test -z "$(noinst_PROGRAMS)" || rm -f $(noinst_PROGRAMS)
+./blackbox.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./drawing.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./gtk.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./malloc.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./midend.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./misc.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./no-icon.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./printing.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./ps.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./random.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./version.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+blackbox$(EXEEXT): $(blackbox_OBJECTS) $(blackbox_DEPENDENCIES) $(EXTRA_blackbox_DEPENDENCIES) 
+        @rm -f blackbox$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(blackbox_OBJECTS) $(blackbox_LDADD) $(LIBS)
+./bridges.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./dsf.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./findloop.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+bridges$(EXEEXT): $(bridges_OBJECTS) $(bridges_DEPENDENCIES) $(EXTRA_bridges_DEPENDENCIES) 
+        @rm -f bridges$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(bridges_OBJECTS) $(bridges_LDADD) $(LIBS)
+./cube.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+cube$(EXEEXT): $(cube_OBJECTS) $(cube_DEPENDENCIES) $(EXTRA_cube_DEPENDENCIES) 
+        @rm -f cube$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(cube_OBJECTS) $(cube_LDADD) $(LIBS)
+./dominosa.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./laydomino.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+dominosa$(EXEEXT): $(dominosa_OBJECTS) $(dominosa_DEPENDENCIES) $(EXTRA_dominosa_DEPENDENCIES) 
+        @rm -f dominosa$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(dominosa_OBJECTS) $(dominosa_LDADD) $(LIBS)
+./fifteen.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+fifteen$(EXEEXT): $(fifteen_OBJECTS) $(fifteen_DEPENDENCIES) $(EXTRA_fifteen_DEPENDENCIES) 
+        @rm -f fifteen$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(fifteen_OBJECTS) $(fifteen_LDADD) $(LIBS)
+./nullfe.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+fifteensolver$(EXEEXT): $(fifteensolver_OBJECTS) $(fifteensolver_DEPENDENCIES) $(EXTRA_fifteensolver_DEPENDENCIES) 
+        @rm -f fifteensolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(fifteensolver_OBJECTS) $(fifteensolver_LDADD) $(LIBS)
+./filling.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+filling$(EXEEXT): $(filling_OBJECTS) $(filling_DEPENDENCIES) $(EXTRA_filling_DEPENDENCIES) 
+        @rm -f filling$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(filling_OBJECTS) $(filling_LDADD) $(LIBS)
+
+fillingsolver$(EXEEXT): $(fillingsolver_OBJECTS) $(fillingsolver_DEPENDENCIES) $(EXTRA_fillingsolver_DEPENDENCIES) 
+        @rm -f fillingsolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(fillingsolver_OBJECTS) $(fillingsolver_LDADD) $(LIBS)
+./flip.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./tree234.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+flip$(EXEEXT): $(flip_OBJECTS) $(flip_DEPENDENCIES) $(EXTRA_flip_DEPENDENCIES) 
+        @rm -f flip$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(flip_OBJECTS) $(flip_LDADD) $(LIBS)
+./flood.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+flood$(EXEEXT): $(flood_OBJECTS) $(flood_DEPENDENCIES) $(EXTRA_flood_DEPENDENCIES) 
+        @rm -f flood$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(flood_OBJECTS) $(flood_LDADD) $(LIBS)
+./galaxies.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+galaxies$(EXEEXT): $(galaxies_OBJECTS) $(galaxies_DEPENDENCIES) $(EXTRA_galaxies_DEPENDENCIES) 
+        @rm -f galaxies$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(galaxies_OBJECTS) $(galaxies_LDADD) $(LIBS)
+
+galaxiespicture$(EXEEXT): $(galaxiespicture_OBJECTS) $(galaxiespicture_DEPENDENCIES) $(EXTRA_galaxiespicture_DEPENDENCIES) 
+        @rm -f galaxiespicture$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(galaxiespicture_OBJECTS) $(galaxiespicture_LDADD) $(LIBS)
+
+galaxiessolver$(EXEEXT): $(galaxiessolver_OBJECTS) $(galaxiessolver_DEPENDENCIES) $(EXTRA_galaxiessolver_DEPENDENCIES) 
+        @rm -f galaxiessolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(galaxiessolver_OBJECTS) $(galaxiessolver_LDADD) $(LIBS)
+./guess.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+guess$(EXEEXT): $(guess_OBJECTS) $(guess_DEPENDENCIES) $(EXTRA_guess_DEPENDENCIES) 
+        @rm -f guess$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(guess_OBJECTS) $(guess_LDADD) $(LIBS)
+./inertia.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+inertia$(EXEEXT): $(inertia_OBJECTS) $(inertia_DEPENDENCIES) $(EXTRA_inertia_DEPENDENCIES) 
+        @rm -f inertia$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(inertia_OBJECTS) $(inertia_LDADD) $(LIBS)
+./keen.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./latin.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./maxflow.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+keen$(EXEEXT): $(keen_OBJECTS) $(keen_DEPENDENCIES) $(EXTRA_keen_DEPENDENCIES) 
+        @rm -f keen$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(keen_OBJECTS) $(keen_LDADD) $(LIBS)
+
+keensolver$(EXEEXT): $(keensolver_OBJECTS) $(keensolver_DEPENDENCIES) $(EXTRA_keensolver_DEPENDENCIES) 
+        @rm -f keensolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(keensolver_OBJECTS) $(keensolver_LDADD) $(LIBS)
+
+latincheck$(EXEEXT): $(latincheck_OBJECTS) $(latincheck_DEPENDENCIES) $(EXTRA_latincheck_DEPENDENCIES) 
+        @rm -f latincheck$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(latincheck_OBJECTS) $(latincheck_LDADD) $(LIBS)
+./combi.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./lightup.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+lightup$(EXEEXT): $(lightup_OBJECTS) $(lightup_DEPENDENCIES) $(EXTRA_lightup_DEPENDENCIES) 
+        @rm -f lightup$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(lightup_OBJECTS) $(lightup_LDADD) $(LIBS)
+
+lightupsolver$(EXEEXT): $(lightupsolver_OBJECTS) $(lightupsolver_DEPENDENCIES) $(EXTRA_lightupsolver_DEPENDENCIES) 
+        @rm -f lightupsolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(lightupsolver_OBJECTS) $(lightupsolver_LDADD) $(LIBS)
+./grid.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./loopgen.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./loopy.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./penrose.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+loopy$(EXEEXT): $(loopy_OBJECTS) $(loopy_DEPENDENCIES) $(EXTRA_loopy_DEPENDENCIES) 
+        @rm -f loopy$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(loopy_OBJECTS) $(loopy_LDADD) $(LIBS)
+
+loopysolver$(EXEEXT): $(loopysolver_OBJECTS) $(loopysolver_DEPENDENCIES) $(EXTRA_loopysolver_DEPENDENCIES) 
+        @rm -f loopysolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(loopysolver_OBJECTS) $(loopysolver_LDADD) $(LIBS)
+./magnets.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+magnets$(EXEEXT): $(magnets_OBJECTS) $(magnets_DEPENDENCIES) $(EXTRA_magnets_DEPENDENCIES) 
+        @rm -f magnets$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(magnets_OBJECTS) $(magnets_LDADD) $(LIBS)
+
+magnetssolver$(EXEEXT): $(magnetssolver_OBJECTS) $(magnetssolver_DEPENDENCIES) $(EXTRA_magnetssolver_DEPENDENCIES) 
+        @rm -f magnetssolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(magnetssolver_OBJECTS) $(magnetssolver_LDADD) $(LIBS)
+./map.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+map$(EXEEXT): $(map_OBJECTS) $(map_DEPENDENCIES) $(EXTRA_map_DEPENDENCIES) 
+        @rm -f map$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(map_OBJECTS) $(map_LDADD) $(LIBS)
+
+mapsolver$(EXEEXT): $(mapsolver_OBJECTS) $(mapsolver_DEPENDENCIES) $(EXTRA_mapsolver_DEPENDENCIES) 
+        @rm -f mapsolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(mapsolver_OBJECTS) $(mapsolver_LDADD) $(LIBS)
+
+mineobfusc$(EXEEXT): $(mineobfusc_OBJECTS) $(mineobfusc_DEPENDENCIES) $(EXTRA_mineobfusc_DEPENDENCIES) 
+        @rm -f mineobfusc$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(mineobfusc_OBJECTS) $(mineobfusc_LDADD) $(LIBS)
+./mines.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+mines$(EXEEXT): $(mines_OBJECTS) $(mines_DEPENDENCIES) $(EXTRA_mines_DEPENDENCIES) 
+        @rm -f mines$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(mines_OBJECTS) $(mines_LDADD) $(LIBS)
+./net.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+net$(EXEEXT): $(net_OBJECTS) $(net_DEPENDENCIES) $(EXTRA_net_DEPENDENCIES) 
+        @rm -f net$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(net_OBJECTS) $(net_LDADD) $(LIBS)
+./netslide.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+netslide$(EXEEXT): $(netslide_OBJECTS) $(netslide_DEPENDENCIES) $(EXTRA_netslide_DEPENDENCIES) 
+        @rm -f netslide$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(netslide_OBJECTS) $(netslide_LDADD) $(LIBS)
+./nullgame.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+nullgame$(EXEEXT): $(nullgame_OBJECTS) $(nullgame_DEPENDENCIES) $(EXTRA_nullgame_DEPENDENCIES) 
+        @rm -f nullgame$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(nullgame_OBJECTS) $(nullgame_LDADD) $(LIBS)
+./obfusc.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+obfusc$(EXEEXT): $(obfusc_OBJECTS) $(obfusc_DEPENDENCIES) $(EXTRA_obfusc_DEPENDENCIES) 
+        @rm -f obfusc$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(obfusc_OBJECTS) $(obfusc_LDADD) $(LIBS)
+./divvy.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./palisade.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+palisade$(EXEEXT): $(palisade_OBJECTS) $(palisade_DEPENDENCIES) $(EXTRA_palisade_DEPENDENCIES) 
+        @rm -f palisade$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(palisade_OBJECTS) $(palisade_LDADD) $(LIBS)
+./pattern.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+pattern$(EXEEXT): $(pattern_OBJECTS) $(pattern_DEPENDENCIES) $(EXTRA_pattern_DEPENDENCIES) 
+        @rm -f pattern$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(pattern_OBJECTS) $(pattern_LDADD) $(LIBS)
+
+patternpicture$(EXEEXT): $(patternpicture_OBJECTS) $(patternpicture_DEPENDENCIES) $(EXTRA_patternpicture_DEPENDENCIES) 
+        @rm -f patternpicture$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(patternpicture_OBJECTS) $(patternpicture_LDADD) $(LIBS)
+
+patternsolver$(EXEEXT): $(patternsolver_OBJECTS) $(patternsolver_DEPENDENCIES) $(EXTRA_patternsolver_DEPENDENCIES) 
+        @rm -f patternsolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(patternsolver_OBJECTS) $(patternsolver_LDADD) $(LIBS)
+./pearl.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+./tdq.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+pearl$(EXEEXT): $(pearl_OBJECTS) $(pearl_DEPENDENCIES) $(EXTRA_pearl_DEPENDENCIES) 
+        @rm -f pearl$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(pearl_OBJECTS) $(pearl_LDADD) $(LIBS)
+
+pearlbench$(EXEEXT): $(pearlbench_OBJECTS) $(pearlbench_DEPENDENCIES) $(EXTRA_pearlbench_DEPENDENCIES) 
+        @rm -f pearlbench$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(pearlbench_OBJECTS) $(pearlbench_LDADD) $(LIBS)
+./pegs.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+pegs$(EXEEXT): $(pegs_OBJECTS) $(pegs_DEPENDENCIES) $(EXTRA_pegs_DEPENDENCIES) 
+        @rm -f pegs$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(pegs_OBJECTS) $(pegs_LDADD) $(LIBS)
+./range.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+range$(EXEEXT): $(range_OBJECTS) $(range_DEPENDENCIES) $(EXTRA_range_DEPENDENCIES) 
+        @rm -f range$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(range_OBJECTS) $(range_LDADD) $(LIBS)
+./rect.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+rect$(EXEEXT): $(rect_OBJECTS) $(rect_DEPENDENCIES) $(EXTRA_rect_DEPENDENCIES) 
+        @rm -f rect$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(rect_OBJECTS) $(rect_LDADD) $(LIBS)
+./samegame.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+samegame$(EXEEXT): $(samegame_OBJECTS) $(samegame_DEPENDENCIES) $(EXTRA_samegame_DEPENDENCIES) 
+        @rm -f samegame$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(samegame_OBJECTS) $(samegame_LDADD) $(LIBS)
+./signpost.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+signpost$(EXEEXT): $(signpost_OBJECTS) $(signpost_DEPENDENCIES) $(EXTRA_signpost_DEPENDENCIES) 
+        @rm -f signpost$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(signpost_OBJECTS) $(signpost_LDADD) $(LIBS)
+
+signpostsolver$(EXEEXT): $(signpostsolver_OBJECTS) $(signpostsolver_DEPENDENCIES) $(EXTRA_signpostsolver_DEPENDENCIES) 
+        @rm -f signpostsolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(signpostsolver_OBJECTS) $(signpostsolver_LDADD) $(LIBS)
+./singles.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+singles$(EXEEXT): $(singles_OBJECTS) $(singles_DEPENDENCIES) $(EXTRA_singles_DEPENDENCIES) 
+        @rm -f singles$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(singles_OBJECTS) $(singles_LDADD) $(LIBS)
+
+singlessolver$(EXEEXT): $(singlessolver_OBJECTS) $(singlessolver_DEPENDENCIES) $(EXTRA_singlessolver_DEPENDENCIES) 
+        @rm -f singlessolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(singlessolver_OBJECTS) $(singlessolver_LDADD) $(LIBS)
+./sixteen.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+sixteen$(EXEEXT): $(sixteen_OBJECTS) $(sixteen_DEPENDENCIES) $(EXTRA_sixteen_DEPENDENCIES) 
+        @rm -f sixteen$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(sixteen_OBJECTS) $(sixteen_LDADD) $(LIBS)
+./slant.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+slant$(EXEEXT): $(slant_OBJECTS) $(slant_DEPENDENCIES) $(EXTRA_slant_DEPENDENCIES) 
+        @rm -f slant$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(slant_OBJECTS) $(slant_LDADD) $(LIBS)
+
+slantsolver$(EXEEXT): $(slantsolver_OBJECTS) $(slantsolver_DEPENDENCIES) $(EXTRA_slantsolver_DEPENDENCIES) 
+        @rm -f slantsolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(slantsolver_OBJECTS) $(slantsolver_LDADD) $(LIBS)
+./solo.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+solo$(EXEEXT): $(solo_OBJECTS) $(solo_DEPENDENCIES) $(EXTRA_solo_DEPENDENCIES) 
+        @rm -f solo$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(solo_OBJECTS) $(solo_LDADD) $(LIBS)
+
+solosolver$(EXEEXT): $(solosolver_OBJECTS) $(solosolver_DEPENDENCIES) $(EXTRA_solosolver_DEPENDENCIES) 
+        @rm -f solosolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(solosolver_OBJECTS) $(solosolver_LDADD) $(LIBS)
+./tents.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+tents$(EXEEXT): $(tents_OBJECTS) $(tents_DEPENDENCIES) $(EXTRA_tents_DEPENDENCIES) 
+        @rm -f tents$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(tents_OBJECTS) $(tents_LDADD) $(LIBS)
+
+tentssolver$(EXEEXT): $(tentssolver_OBJECTS) $(tentssolver_DEPENDENCIES) $(EXTRA_tentssolver_DEPENDENCIES) 
+        @rm -f tentssolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(tentssolver_OBJECTS) $(tentssolver_LDADD) $(LIBS)
+./towers.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+towers$(EXEEXT): $(towers_OBJECTS) $(towers_DEPENDENCIES) $(EXTRA_towers_DEPENDENCIES) 
+        @rm -f towers$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(towers_OBJECTS) $(towers_LDADD) $(LIBS)
+
+towerssolver$(EXEEXT): $(towerssolver_OBJECTS) $(towerssolver_DEPENDENCIES) $(EXTRA_towerssolver_DEPENDENCIES) 
+        @rm -f towerssolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(towerssolver_OBJECTS) $(towerssolver_LDADD) $(LIBS)
+./tracks.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+tracks$(EXEEXT): $(tracks_OBJECTS) $(tracks_DEPENDENCIES) $(EXTRA_tracks_DEPENDENCIES) 
+        @rm -f tracks$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(tracks_OBJECTS) $(tracks_LDADD) $(LIBS)
+./twiddle.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+twiddle$(EXEEXT): $(twiddle_OBJECTS) $(twiddle_DEPENDENCIES) $(EXTRA_twiddle_DEPENDENCIES) 
+        @rm -f twiddle$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(twiddle_OBJECTS) $(twiddle_LDADD) $(LIBS)
+./undead.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+undead$(EXEEXT): $(undead_OBJECTS) $(undead_DEPENDENCIES) $(EXTRA_undead_DEPENDENCIES) 
+        @rm -f undead$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(undead_OBJECTS) $(undead_LDADD) $(LIBS)
+./unequal.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+unequal$(EXEEXT): $(unequal_OBJECTS) $(unequal_DEPENDENCIES) $(EXTRA_unequal_DEPENDENCIES) 
+        @rm -f unequal$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(unequal_OBJECTS) $(unequal_LDADD) $(LIBS)
+
+unequalsolver$(EXEEXT): $(unequalsolver_OBJECTS) $(unequalsolver_DEPENDENCIES) $(EXTRA_unequalsolver_DEPENDENCIES) 
+        @rm -f unequalsolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(unequalsolver_OBJECTS) $(unequalsolver_LDADD) $(LIBS)
+./unruly.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+unruly$(EXEEXT): $(unruly_OBJECTS) $(unruly_DEPENDENCIES) $(EXTRA_unruly_DEPENDENCIES) 
+        @rm -f unruly$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(unruly_OBJECTS) $(unruly_LDADD) $(LIBS)
+
+unrulysolver$(EXEEXT): $(unrulysolver_OBJECTS) $(unrulysolver_DEPENDENCIES) $(EXTRA_unrulysolver_DEPENDENCIES) 
+        @rm -f unrulysolver$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(unrulysolver_OBJECTS) $(unrulysolver_LDADD) $(LIBS)
+./untangle.$(OBJEXT): ./$(am__dirstamp) $(DEPDIR)/$(am__dirstamp)
+
+untangle$(EXEEXT): $(untangle_OBJECTS) $(untangle_DEPENDENCIES) $(EXTRA_untangle_DEPENDENCIES) 
+        @rm -f untangle$(EXEEXT)
+        $(AM_V_CCLD)$(LINK) $(untangle_OBJECTS) $(untangle_LDADD) $(LIBS)
+
+mostlyclean-compile:
+        -rm -f *.$(OBJEXT)
+        -rm -f ./*.$(OBJEXT)
+
+distclean-compile:
+        -rm -f *.tab.c
+
+include ./$(DEPDIR)/blackbox.Po
+include ./$(DEPDIR)/bridges.Po
+include ./$(DEPDIR)/combi.Po
+include ./$(DEPDIR)/cube.Po
+include ./$(DEPDIR)/divvy.Po
+include ./$(DEPDIR)/dominosa.Po
+include ./$(DEPDIR)/drawing.Po
+include ./$(DEPDIR)/dsf.Po
+include ./$(DEPDIR)/fifteen.Po
+include ./$(DEPDIR)/filling.Po
+include ./$(DEPDIR)/findloop.Po
+include ./$(DEPDIR)/flip.Po
+include ./$(DEPDIR)/flood.Po
+include ./$(DEPDIR)/galaxies.Po
+include ./$(DEPDIR)/grid.Po
+include ./$(DEPDIR)/gtk.Po
+include ./$(DEPDIR)/guess.Po
+include ./$(DEPDIR)/inertia.Po
+include ./$(DEPDIR)/keen.Po
+include ./$(DEPDIR)/latin.Po
+include ./$(DEPDIR)/laydomino.Po
+include ./$(DEPDIR)/libfifteen2_a-fifteen.Po
+include ./$(DEPDIR)/libfilling2_a-filling.Po
+include ./$(DEPDIR)/libgalaxie2_a-galaxies.Po
+include ./$(DEPDIR)/libgalaxie4_a-galaxies.Po
+include ./$(DEPDIR)/libkeen2_a-keen.Po
+include ./$(DEPDIR)/liblatin6_a-latin.Po
+include ./$(DEPDIR)/liblatin8_a-latin.Po
+include ./$(DEPDIR)/liblightup2_a-lightup.Po
+include ./$(DEPDIR)/libloopy2_a-loopy.Po
+include ./$(DEPDIR)/libmagnets2_a-magnets.Po
+include ./$(DEPDIR)/libmap2_a-map.Po
+include ./$(DEPDIR)/libmines2_a-mines.Po
+include ./$(DEPDIR)/libpattern2_a-pattern.Po
+include ./$(DEPDIR)/libpattern4_a-pattern.Po
+include ./$(DEPDIR)/libpearl2_a-pearl.Po
+include ./$(DEPDIR)/libsignpos2_a-signpost.Po
+include ./$(DEPDIR)/libsingles3_a-singles.Po
+include ./$(DEPDIR)/libslant2_a-slant.Po
+include ./$(DEPDIR)/libsolo2_a-solo.Po
+include ./$(DEPDIR)/libtents3_a-tents.Po
+include ./$(DEPDIR)/libtowers2_a-towers.Po
+include ./$(DEPDIR)/libunequal2_a-unequal.Po
+include ./$(DEPDIR)/libunruly2_a-unruly.Po
+include ./$(DEPDIR)/lightup.Po
+include ./$(DEPDIR)/loopgen.Po
+include ./$(DEPDIR)/loopy.Po
+include ./$(DEPDIR)/magnets.Po
+include ./$(DEPDIR)/malloc.Po
+include ./$(DEPDIR)/map.Po
+include ./$(DEPDIR)/maxflow.Po
+include ./$(DEPDIR)/midend.Po
+include ./$(DEPDIR)/mines.Po
+include ./$(DEPDIR)/misc.Po
+include ./$(DEPDIR)/net.Po
+include ./$(DEPDIR)/netslide.Po
+include ./$(DEPDIR)/no-icon.Po
+include ./$(DEPDIR)/nullfe.Po
+include ./$(DEPDIR)/nullgame.Po
+include ./$(DEPDIR)/obfusc.Po
+include ./$(DEPDIR)/palisade.Po
+include ./$(DEPDIR)/pattern.Po
+include ./$(DEPDIR)/pearl.Po
+include ./$(DEPDIR)/pegs.Po
+include ./$(DEPDIR)/penrose.Po
+include ./$(DEPDIR)/printing.Po
+include ./$(DEPDIR)/ps.Po
+include ./$(DEPDIR)/random.Po
+include ./$(DEPDIR)/range.Po
+include ./$(DEPDIR)/rect.Po
+include ./$(DEPDIR)/samegame.Po
+include ./$(DEPDIR)/signpost.Po
+include ./$(DEPDIR)/singles.Po
+include ./$(DEPDIR)/sixteen.Po
+include ./$(DEPDIR)/slant.Po
+include ./$(DEPDIR)/solo.Po
+include ./$(DEPDIR)/tdq.Po
+include ./$(DEPDIR)/tents.Po
+include ./$(DEPDIR)/towers.Po
+include ./$(DEPDIR)/tracks.Po
+include ./$(DEPDIR)/tree234.Po
+include ./$(DEPDIR)/twiddle.Po
+include ./$(DEPDIR)/undead.Po
+include ./$(DEPDIR)/unequal.Po
+include ./$(DEPDIR)/unruly.Po
+include ./$(DEPDIR)/untangle.Po
+include ./$(DEPDIR)/version.Po
+
+.c.o:
+        $(AM_V_CC)depbase=`echo $@ | sed 's|[^/]*$$|$(DEPDIR)/&|;s|\.o$$||'`;\
+        $(COMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ $< &&\
+        $(am__mv) $$depbase.Tpo $$depbase.Po
+#       $(AM_V_CC)source='$<' object='$@' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(COMPILE) -c -o $@ $<
+
+.c.obj:
+        $(AM_V_CC)depbase=`echo $@ | sed 's|[^/]*$$|$(DEPDIR)/&|;s|\.obj$$||'`;\
+        $(COMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ `$(CYGPATH_W) '$<'` &&\
+        $(am__mv) $$depbase.Tpo $$depbase.Po
+#       $(AM_V_CC)source='$<' object='$@' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(COMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
+
+./libfifteen2_a-fifteen.o: ./fifteen.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libfifteen2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libfifteen2_a-fifteen.o -MD -MP -MF $(DEPDIR)/libfifteen2_a-fifteen.Tpo -c -o ./libfifteen2_a-fifteen.o `test -f './fifteen.c' || echo '$(srcdir)/'`./fifteen.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libfifteen2_a-fifteen.Tpo $(DEPDIR)/libfifteen2_a-fifteen.Po
+#       $(AM_V_CC)source='./fifteen.c' object='./libfifteen2_a-fifteen.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libfifteen2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libfifteen2_a-fifteen.o `test -f './fifteen.c' || echo '$(srcdir)/'`./fifteen.c
+
+./libfifteen2_a-fifteen.obj: ./fifteen.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libfifteen2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libfifteen2_a-fifteen.obj -MD -MP -MF $(DEPDIR)/libfifteen2_a-fifteen.Tpo -c -o ./libfifteen2_a-fifteen.obj `if test -f './fifteen.c'; then $(CYGPATH_W) './fifteen.c'; else $(CYGPATH_W) '$(srcdir)/./fifteen.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libfifteen2_a-fifteen.Tpo $(DEPDIR)/libfifteen2_a-fifteen.Po
+#       $(AM_V_CC)source='./fifteen.c' object='./libfifteen2_a-fifteen.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libfifteen2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libfifteen2_a-fifteen.obj `if test -f './fifteen.c'; then $(CYGPATH_W) './fifteen.c'; else $(CYGPATH_W) '$(srcdir)/./fifteen.c'; fi`
+
+./libfilling2_a-filling.o: ./filling.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libfilling2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libfilling2_a-filling.o -MD -MP -MF $(DEPDIR)/libfilling2_a-filling.Tpo -c -o ./libfilling2_a-filling.o `test -f './filling.c' || echo '$(srcdir)/'`./filling.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libfilling2_a-filling.Tpo $(DEPDIR)/libfilling2_a-filling.Po
+#       $(AM_V_CC)source='./filling.c' object='./libfilling2_a-filling.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libfilling2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libfilling2_a-filling.o `test -f './filling.c' || echo '$(srcdir)/'`./filling.c
+
+./libfilling2_a-filling.obj: ./filling.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libfilling2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libfilling2_a-filling.obj -MD -MP -MF $(DEPDIR)/libfilling2_a-filling.Tpo -c -o ./libfilling2_a-filling.obj `if test -f './filling.c'; then $(CYGPATH_W) './filling.c'; else $(CYGPATH_W) '$(srcdir)/./filling.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libfilling2_a-filling.Tpo $(DEPDIR)/libfilling2_a-filling.Po
+#       $(AM_V_CC)source='./filling.c' object='./libfilling2_a-filling.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libfilling2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libfilling2_a-filling.obj `if test -f './filling.c'; then $(CYGPATH_W) './filling.c'; else $(CYGPATH_W) '$(srcdir)/./filling.c'; fi`
+
+./libgalaxie2_a-galaxies.o: ./galaxies.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libgalaxie2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libgalaxie2_a-galaxies.o -MD -MP -MF $(DEPDIR)/libgalaxie2_a-galaxies.Tpo -c -o ./libgalaxie2_a-galaxies.o `test -f './galaxies.c' || echo '$(srcdir)/'`./galaxies.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libgalaxie2_a-galaxies.Tpo $(DEPDIR)/libgalaxie2_a-galaxies.Po
+#       $(AM_V_CC)source='./galaxies.c' object='./libgalaxie2_a-galaxies.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libgalaxie2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libgalaxie2_a-galaxies.o `test -f './galaxies.c' || echo '$(srcdir)/'`./galaxies.c
+
+./libgalaxie2_a-galaxies.obj: ./galaxies.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libgalaxie2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libgalaxie2_a-galaxies.obj -MD -MP -MF $(DEPDIR)/libgalaxie2_a-galaxies.Tpo -c -o ./libgalaxie2_a-galaxies.obj `if test -f './galaxies.c'; then $(CYGPATH_W) './galaxies.c'; else $(CYGPATH_W) '$(srcdir)/./galaxies.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libgalaxie2_a-galaxies.Tpo $(DEPDIR)/libgalaxie2_a-galaxies.Po
+#       $(AM_V_CC)source='./galaxies.c' object='./libgalaxie2_a-galaxies.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libgalaxie2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libgalaxie2_a-galaxies.obj `if test -f './galaxies.c'; then $(CYGPATH_W) './galaxies.c'; else $(CYGPATH_W) '$(srcdir)/./galaxies.c'; fi`
+
+./libgalaxie4_a-galaxies.o: ./galaxies.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libgalaxie4_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libgalaxie4_a-galaxies.o -MD -MP -MF $(DEPDIR)/libgalaxie4_a-galaxies.Tpo -c -o ./libgalaxie4_a-galaxies.o `test -f './galaxies.c' || echo '$(srcdir)/'`./galaxies.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libgalaxie4_a-galaxies.Tpo $(DEPDIR)/libgalaxie4_a-galaxies.Po
+#       $(AM_V_CC)source='./galaxies.c' object='./libgalaxie4_a-galaxies.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libgalaxie4_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libgalaxie4_a-galaxies.o `test -f './galaxies.c' || echo '$(srcdir)/'`./galaxies.c
+
+./libgalaxie4_a-galaxies.obj: ./galaxies.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libgalaxie4_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libgalaxie4_a-galaxies.obj -MD -MP -MF $(DEPDIR)/libgalaxie4_a-galaxies.Tpo -c -o ./libgalaxie4_a-galaxies.obj `if test -f './galaxies.c'; then $(CYGPATH_W) './galaxies.c'; else $(CYGPATH_W) '$(srcdir)/./galaxies.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libgalaxie4_a-galaxies.Tpo $(DEPDIR)/libgalaxie4_a-galaxies.Po
+#       $(AM_V_CC)source='./galaxies.c' object='./libgalaxie4_a-galaxies.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libgalaxie4_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libgalaxie4_a-galaxies.obj `if test -f './galaxies.c'; then $(CYGPATH_W) './galaxies.c'; else $(CYGPATH_W) '$(srcdir)/./galaxies.c'; fi`
+
+./libkeen2_a-keen.o: ./keen.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libkeen2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libkeen2_a-keen.o -MD -MP -MF $(DEPDIR)/libkeen2_a-keen.Tpo -c -o ./libkeen2_a-keen.o `test -f './keen.c' || echo '$(srcdir)/'`./keen.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libkeen2_a-keen.Tpo $(DEPDIR)/libkeen2_a-keen.Po
+#       $(AM_V_CC)source='./keen.c' object='./libkeen2_a-keen.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libkeen2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libkeen2_a-keen.o `test -f './keen.c' || echo '$(srcdir)/'`./keen.c
+
+./libkeen2_a-keen.obj: ./keen.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libkeen2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libkeen2_a-keen.obj -MD -MP -MF $(DEPDIR)/libkeen2_a-keen.Tpo -c -o ./libkeen2_a-keen.obj `if test -f './keen.c'; then $(CYGPATH_W) './keen.c'; else $(CYGPATH_W) '$(srcdir)/./keen.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libkeen2_a-keen.Tpo $(DEPDIR)/libkeen2_a-keen.Po
+#       $(AM_V_CC)source='./keen.c' object='./libkeen2_a-keen.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libkeen2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libkeen2_a-keen.obj `if test -f './keen.c'; then $(CYGPATH_W) './keen.c'; else $(CYGPATH_W) '$(srcdir)/./keen.c'; fi`
+
+./liblatin6_a-latin.o: ./latin.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(liblatin6_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./liblatin6_a-latin.o -MD -MP -MF $(DEPDIR)/liblatin6_a-latin.Tpo -c -o ./liblatin6_a-latin.o `test -f './latin.c' || echo '$(srcdir)/'`./latin.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/liblatin6_a-latin.Tpo $(DEPDIR)/liblatin6_a-latin.Po
+#       $(AM_V_CC)source='./latin.c' object='./liblatin6_a-latin.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(liblatin6_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./liblatin6_a-latin.o `test -f './latin.c' || echo '$(srcdir)/'`./latin.c
+
+./liblatin6_a-latin.obj: ./latin.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(liblatin6_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./liblatin6_a-latin.obj -MD -MP -MF $(DEPDIR)/liblatin6_a-latin.Tpo -c -o ./liblatin6_a-latin.obj `if test -f './latin.c'; then $(CYGPATH_W) './latin.c'; else $(CYGPATH_W) '$(srcdir)/./latin.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/liblatin6_a-latin.Tpo $(DEPDIR)/liblatin6_a-latin.Po
+#       $(AM_V_CC)source='./latin.c' object='./liblatin6_a-latin.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(liblatin6_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./liblatin6_a-latin.obj `if test -f './latin.c'; then $(CYGPATH_W) './latin.c'; else $(CYGPATH_W) '$(srcdir)/./latin.c'; fi`
+
+./liblatin8_a-latin.o: ./latin.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(liblatin8_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./liblatin8_a-latin.o -MD -MP -MF $(DEPDIR)/liblatin8_a-latin.Tpo -c -o ./liblatin8_a-latin.o `test -f './latin.c' || echo '$(srcdir)/'`./latin.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/liblatin8_a-latin.Tpo $(DEPDIR)/liblatin8_a-latin.Po
+#       $(AM_V_CC)source='./latin.c' object='./liblatin8_a-latin.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(liblatin8_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./liblatin8_a-latin.o `test -f './latin.c' || echo '$(srcdir)/'`./latin.c
+
+./liblatin8_a-latin.obj: ./latin.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(liblatin8_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./liblatin8_a-latin.obj -MD -MP -MF $(DEPDIR)/liblatin8_a-latin.Tpo -c -o ./liblatin8_a-latin.obj `if test -f './latin.c'; then $(CYGPATH_W) './latin.c'; else $(CYGPATH_W) '$(srcdir)/./latin.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/liblatin8_a-latin.Tpo $(DEPDIR)/liblatin8_a-latin.Po
+#       $(AM_V_CC)source='./latin.c' object='./liblatin8_a-latin.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(liblatin8_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./liblatin8_a-latin.obj `if test -f './latin.c'; then $(CYGPATH_W) './latin.c'; else $(CYGPATH_W) '$(srcdir)/./latin.c'; fi`
+
+./liblightup2_a-lightup.o: ./lightup.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(liblightup2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./liblightup2_a-lightup.o -MD -MP -MF $(DEPDIR)/liblightup2_a-lightup.Tpo -c -o ./liblightup2_a-lightup.o `test -f './lightup.c' || echo '$(srcdir)/'`./lightup.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/liblightup2_a-lightup.Tpo $(DEPDIR)/liblightup2_a-lightup.Po
+#       $(AM_V_CC)source='./lightup.c' object='./liblightup2_a-lightup.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(liblightup2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./liblightup2_a-lightup.o `test -f './lightup.c' || echo '$(srcdir)/'`./lightup.c
+
+./liblightup2_a-lightup.obj: ./lightup.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(liblightup2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./liblightup2_a-lightup.obj -MD -MP -MF $(DEPDIR)/liblightup2_a-lightup.Tpo -c -o ./liblightup2_a-lightup.obj `if test -f './lightup.c'; then $(CYGPATH_W) './lightup.c'; else $(CYGPATH_W) '$(srcdir)/./lightup.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/liblightup2_a-lightup.Tpo $(DEPDIR)/liblightup2_a-lightup.Po
+#       $(AM_V_CC)source='./lightup.c' object='./liblightup2_a-lightup.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(liblightup2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./liblightup2_a-lightup.obj `if test -f './lightup.c'; then $(CYGPATH_W) './lightup.c'; else $(CYGPATH_W) '$(srcdir)/./lightup.c'; fi`
+
+./libloopy2_a-loopy.o: ./loopy.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libloopy2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libloopy2_a-loopy.o -MD -MP -MF $(DEPDIR)/libloopy2_a-loopy.Tpo -c -o ./libloopy2_a-loopy.o `test -f './loopy.c' || echo '$(srcdir)/'`./loopy.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libloopy2_a-loopy.Tpo $(DEPDIR)/libloopy2_a-loopy.Po
+#       $(AM_V_CC)source='./loopy.c' object='./libloopy2_a-loopy.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libloopy2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libloopy2_a-loopy.o `test -f './loopy.c' || echo '$(srcdir)/'`./loopy.c
+
+./libloopy2_a-loopy.obj: ./loopy.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libloopy2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libloopy2_a-loopy.obj -MD -MP -MF $(DEPDIR)/libloopy2_a-loopy.Tpo -c -o ./libloopy2_a-loopy.obj `if test -f './loopy.c'; then $(CYGPATH_W) './loopy.c'; else $(CYGPATH_W) '$(srcdir)/./loopy.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libloopy2_a-loopy.Tpo $(DEPDIR)/libloopy2_a-loopy.Po
+#       $(AM_V_CC)source='./loopy.c' object='./libloopy2_a-loopy.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libloopy2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libloopy2_a-loopy.obj `if test -f './loopy.c'; then $(CYGPATH_W) './loopy.c'; else $(CYGPATH_W) '$(srcdir)/./loopy.c'; fi`
+
+./libmagnets2_a-magnets.o: ./magnets.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmagnets2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libmagnets2_a-magnets.o -MD -MP -MF $(DEPDIR)/libmagnets2_a-magnets.Tpo -c -o ./libmagnets2_a-magnets.o `test -f './magnets.c' || echo '$(srcdir)/'`./magnets.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libmagnets2_a-magnets.Tpo $(DEPDIR)/libmagnets2_a-magnets.Po
+#       $(AM_V_CC)source='./magnets.c' object='./libmagnets2_a-magnets.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmagnets2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libmagnets2_a-magnets.o `test -f './magnets.c' || echo '$(srcdir)/'`./magnets.c
+
+./libmagnets2_a-magnets.obj: ./magnets.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmagnets2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libmagnets2_a-magnets.obj -MD -MP -MF $(DEPDIR)/libmagnets2_a-magnets.Tpo -c -o ./libmagnets2_a-magnets.obj `if test -f './magnets.c'; then $(CYGPATH_W) './magnets.c'; else $(CYGPATH_W) '$(srcdir)/./magnets.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libmagnets2_a-magnets.Tpo $(DEPDIR)/libmagnets2_a-magnets.Po
+#       $(AM_V_CC)source='./magnets.c' object='./libmagnets2_a-magnets.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmagnets2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libmagnets2_a-magnets.obj `if test -f './magnets.c'; then $(CYGPATH_W) './magnets.c'; else $(CYGPATH_W) '$(srcdir)/./magnets.c'; fi`
+
+./libmap2_a-map.o: ./map.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmap2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libmap2_a-map.o -MD -MP -MF $(DEPDIR)/libmap2_a-map.Tpo -c -o ./libmap2_a-map.o `test -f './map.c' || echo '$(srcdir)/'`./map.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libmap2_a-map.Tpo $(DEPDIR)/libmap2_a-map.Po
+#       $(AM_V_CC)source='./map.c' object='./libmap2_a-map.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmap2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libmap2_a-map.o `test -f './map.c' || echo '$(srcdir)/'`./map.c
+
+./libmap2_a-map.obj: ./map.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmap2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libmap2_a-map.obj -MD -MP -MF $(DEPDIR)/libmap2_a-map.Tpo -c -o ./libmap2_a-map.obj `if test -f './map.c'; then $(CYGPATH_W) './map.c'; else $(CYGPATH_W) '$(srcdir)/./map.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libmap2_a-map.Tpo $(DEPDIR)/libmap2_a-map.Po
+#       $(AM_V_CC)source='./map.c' object='./libmap2_a-map.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmap2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libmap2_a-map.obj `if test -f './map.c'; then $(CYGPATH_W) './map.c'; else $(CYGPATH_W) '$(srcdir)/./map.c'; fi`
+
+./libmines2_a-mines.o: ./mines.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmines2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libmines2_a-mines.o -MD -MP -MF $(DEPDIR)/libmines2_a-mines.Tpo -c -o ./libmines2_a-mines.o `test -f './mines.c' || echo '$(srcdir)/'`./mines.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libmines2_a-mines.Tpo $(DEPDIR)/libmines2_a-mines.Po
+#       $(AM_V_CC)source='./mines.c' object='./libmines2_a-mines.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmines2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libmines2_a-mines.o `test -f './mines.c' || echo '$(srcdir)/'`./mines.c
+
+./libmines2_a-mines.obj: ./mines.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmines2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libmines2_a-mines.obj -MD -MP -MF $(DEPDIR)/libmines2_a-mines.Tpo -c -o ./libmines2_a-mines.obj `if test -f './mines.c'; then $(CYGPATH_W) './mines.c'; else $(CYGPATH_W) '$(srcdir)/./mines.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libmines2_a-mines.Tpo $(DEPDIR)/libmines2_a-mines.Po
+#       $(AM_V_CC)source='./mines.c' object='./libmines2_a-mines.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libmines2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libmines2_a-mines.obj `if test -f './mines.c'; then $(CYGPATH_W) './mines.c'; else $(CYGPATH_W) '$(srcdir)/./mines.c'; fi`
+
+./libpattern2_a-pattern.o: ./pattern.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpattern2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libpattern2_a-pattern.o -MD -MP -MF $(DEPDIR)/libpattern2_a-pattern.Tpo -c -o ./libpattern2_a-pattern.o `test -f './pattern.c' || echo '$(srcdir)/'`./pattern.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libpattern2_a-pattern.Tpo $(DEPDIR)/libpattern2_a-pattern.Po
+#       $(AM_V_CC)source='./pattern.c' object='./libpattern2_a-pattern.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpattern2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libpattern2_a-pattern.o `test -f './pattern.c' || echo '$(srcdir)/'`./pattern.c
+
+./libpattern2_a-pattern.obj: ./pattern.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpattern2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libpattern2_a-pattern.obj -MD -MP -MF $(DEPDIR)/libpattern2_a-pattern.Tpo -c -o ./libpattern2_a-pattern.obj `if test -f './pattern.c'; then $(CYGPATH_W) './pattern.c'; else $(CYGPATH_W) '$(srcdir)/./pattern.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libpattern2_a-pattern.Tpo $(DEPDIR)/libpattern2_a-pattern.Po
+#       $(AM_V_CC)source='./pattern.c' object='./libpattern2_a-pattern.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpattern2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libpattern2_a-pattern.obj `if test -f './pattern.c'; then $(CYGPATH_W) './pattern.c'; else $(CYGPATH_W) '$(srcdir)/./pattern.c'; fi`
+
+./libpattern4_a-pattern.o: ./pattern.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpattern4_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libpattern4_a-pattern.o -MD -MP -MF $(DEPDIR)/libpattern4_a-pattern.Tpo -c -o ./libpattern4_a-pattern.o `test -f './pattern.c' || echo '$(srcdir)/'`./pattern.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libpattern4_a-pattern.Tpo $(DEPDIR)/libpattern4_a-pattern.Po
+#       $(AM_V_CC)source='./pattern.c' object='./libpattern4_a-pattern.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpattern4_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libpattern4_a-pattern.o `test -f './pattern.c' || echo '$(srcdir)/'`./pattern.c
+
+./libpattern4_a-pattern.obj: ./pattern.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpattern4_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libpattern4_a-pattern.obj -MD -MP -MF $(DEPDIR)/libpattern4_a-pattern.Tpo -c -o ./libpattern4_a-pattern.obj `if test -f './pattern.c'; then $(CYGPATH_W) './pattern.c'; else $(CYGPATH_W) '$(srcdir)/./pattern.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libpattern4_a-pattern.Tpo $(DEPDIR)/libpattern4_a-pattern.Po
+#       $(AM_V_CC)source='./pattern.c' object='./libpattern4_a-pattern.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpattern4_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libpattern4_a-pattern.obj `if test -f './pattern.c'; then $(CYGPATH_W) './pattern.c'; else $(CYGPATH_W) '$(srcdir)/./pattern.c'; fi`
+
+./libpearl2_a-pearl.o: ./pearl.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpearl2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libpearl2_a-pearl.o -MD -MP -MF $(DEPDIR)/libpearl2_a-pearl.Tpo -c -o ./libpearl2_a-pearl.o `test -f './pearl.c' || echo '$(srcdir)/'`./pearl.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libpearl2_a-pearl.Tpo $(DEPDIR)/libpearl2_a-pearl.Po
+#       $(AM_V_CC)source='./pearl.c' object='./libpearl2_a-pearl.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpearl2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libpearl2_a-pearl.o `test -f './pearl.c' || echo '$(srcdir)/'`./pearl.c
+
+./libpearl2_a-pearl.obj: ./pearl.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpearl2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libpearl2_a-pearl.obj -MD -MP -MF $(DEPDIR)/libpearl2_a-pearl.Tpo -c -o ./libpearl2_a-pearl.obj `if test -f './pearl.c'; then $(CYGPATH_W) './pearl.c'; else $(CYGPATH_W) '$(srcdir)/./pearl.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libpearl2_a-pearl.Tpo $(DEPDIR)/libpearl2_a-pearl.Po
+#       $(AM_V_CC)source='./pearl.c' object='./libpearl2_a-pearl.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpearl2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libpearl2_a-pearl.obj `if test -f './pearl.c'; then $(CYGPATH_W) './pearl.c'; else $(CYGPATH_W) '$(srcdir)/./pearl.c'; fi`
+
+./libsignpos2_a-signpost.o: ./signpost.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libsignpos2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libsignpos2_a-signpost.o -MD -MP -MF $(DEPDIR)/libsignpos2_a-signpost.Tpo -c -o ./libsignpos2_a-signpost.o `test -f './signpost.c' || echo '$(srcdir)/'`./signpost.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libsignpos2_a-signpost.Tpo $(DEPDIR)/libsignpos2_a-signpost.Po
+#       $(AM_V_CC)source='./signpost.c' object='./libsignpos2_a-signpost.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libsignpos2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libsignpos2_a-signpost.o `test -f './signpost.c' || echo '$(srcdir)/'`./signpost.c
+
+./libsignpos2_a-signpost.obj: ./signpost.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libsignpos2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libsignpos2_a-signpost.obj -MD -MP -MF $(DEPDIR)/libsignpos2_a-signpost.Tpo -c -o ./libsignpos2_a-signpost.obj `if test -f './signpost.c'; then $(CYGPATH_W) './signpost.c'; else $(CYGPATH_W) '$(srcdir)/./signpost.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libsignpos2_a-signpost.Tpo $(DEPDIR)/libsignpos2_a-signpost.Po
+#       $(AM_V_CC)source='./signpost.c' object='./libsignpos2_a-signpost.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libsignpos2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libsignpos2_a-signpost.obj `if test -f './signpost.c'; then $(CYGPATH_W) './signpost.c'; else $(CYGPATH_W) '$(srcdir)/./signpost.c'; fi`
+
+./libsingles3_a-singles.o: ./singles.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libsingles3_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libsingles3_a-singles.o -MD -MP -MF $(DEPDIR)/libsingles3_a-singles.Tpo -c -o ./libsingles3_a-singles.o `test -f './singles.c' || echo '$(srcdir)/'`./singles.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libsingles3_a-singles.Tpo $(DEPDIR)/libsingles3_a-singles.Po
+#       $(AM_V_CC)source='./singles.c' object='./libsingles3_a-singles.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libsingles3_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libsingles3_a-singles.o `test -f './singles.c' || echo '$(srcdir)/'`./singles.c
+
+./libsingles3_a-singles.obj: ./singles.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libsingles3_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libsingles3_a-singles.obj -MD -MP -MF $(DEPDIR)/libsingles3_a-singles.Tpo -c -o ./libsingles3_a-singles.obj `if test -f './singles.c'; then $(CYGPATH_W) './singles.c'; else $(CYGPATH_W) '$(srcdir)/./singles.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libsingles3_a-singles.Tpo $(DEPDIR)/libsingles3_a-singles.Po
+#       $(AM_V_CC)source='./singles.c' object='./libsingles3_a-singles.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libsingles3_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libsingles3_a-singles.obj `if test -f './singles.c'; then $(CYGPATH_W) './singles.c'; else $(CYGPATH_W) '$(srcdir)/./singles.c'; fi`
+
+./libslant2_a-slant.o: ./slant.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libslant2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libslant2_a-slant.o -MD -MP -MF $(DEPDIR)/libslant2_a-slant.Tpo -c -o ./libslant2_a-slant.o `test -f './slant.c' || echo '$(srcdir)/'`./slant.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libslant2_a-slant.Tpo $(DEPDIR)/libslant2_a-slant.Po
+#       $(AM_V_CC)source='./slant.c' object='./libslant2_a-slant.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libslant2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libslant2_a-slant.o `test -f './slant.c' || echo '$(srcdir)/'`./slant.c
+
+./libslant2_a-slant.obj: ./slant.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libslant2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libslant2_a-slant.obj -MD -MP -MF $(DEPDIR)/libslant2_a-slant.Tpo -c -o ./libslant2_a-slant.obj `if test -f './slant.c'; then $(CYGPATH_W) './slant.c'; else $(CYGPATH_W) '$(srcdir)/./slant.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libslant2_a-slant.Tpo $(DEPDIR)/libslant2_a-slant.Po
+#       $(AM_V_CC)source='./slant.c' object='./libslant2_a-slant.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libslant2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libslant2_a-slant.obj `if test -f './slant.c'; then $(CYGPATH_W) './slant.c'; else $(CYGPATH_W) '$(srcdir)/./slant.c'; fi`
+
+./libsolo2_a-solo.o: ./solo.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libsolo2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libsolo2_a-solo.o -MD -MP -MF $(DEPDIR)/libsolo2_a-solo.Tpo -c -o ./libsolo2_a-solo.o `test -f './solo.c' || echo '$(srcdir)/'`./solo.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libsolo2_a-solo.Tpo $(DEPDIR)/libsolo2_a-solo.Po
+#       $(AM_V_CC)source='./solo.c' object='./libsolo2_a-solo.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libsolo2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libsolo2_a-solo.o `test -f './solo.c' || echo '$(srcdir)/'`./solo.c
+
+./libsolo2_a-solo.obj: ./solo.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libsolo2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libsolo2_a-solo.obj -MD -MP -MF $(DEPDIR)/libsolo2_a-solo.Tpo -c -o ./libsolo2_a-solo.obj `if test -f './solo.c'; then $(CYGPATH_W) './solo.c'; else $(CYGPATH_W) '$(srcdir)/./solo.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libsolo2_a-solo.Tpo $(DEPDIR)/libsolo2_a-solo.Po
+#       $(AM_V_CC)source='./solo.c' object='./libsolo2_a-solo.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libsolo2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libsolo2_a-solo.obj `if test -f './solo.c'; then $(CYGPATH_W) './solo.c'; else $(CYGPATH_W) '$(srcdir)/./solo.c'; fi`
+
+./libtents3_a-tents.o: ./tents.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libtents3_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libtents3_a-tents.o -MD -MP -MF $(DEPDIR)/libtents3_a-tents.Tpo -c -o ./libtents3_a-tents.o `test -f './tents.c' || echo '$(srcdir)/'`./tents.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libtents3_a-tents.Tpo $(DEPDIR)/libtents3_a-tents.Po
+#       $(AM_V_CC)source='./tents.c' object='./libtents3_a-tents.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libtents3_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libtents3_a-tents.o `test -f './tents.c' || echo '$(srcdir)/'`./tents.c
+
+./libtents3_a-tents.obj: ./tents.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libtents3_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libtents3_a-tents.obj -MD -MP -MF $(DEPDIR)/libtents3_a-tents.Tpo -c -o ./libtents3_a-tents.obj `if test -f './tents.c'; then $(CYGPATH_W) './tents.c'; else $(CYGPATH_W) '$(srcdir)/./tents.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libtents3_a-tents.Tpo $(DEPDIR)/libtents3_a-tents.Po
+#       $(AM_V_CC)source='./tents.c' object='./libtents3_a-tents.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libtents3_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libtents3_a-tents.obj `if test -f './tents.c'; then $(CYGPATH_W) './tents.c'; else $(CYGPATH_W) '$(srcdir)/./tents.c'; fi`
+
+./libtowers2_a-towers.o: ./towers.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libtowers2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libtowers2_a-towers.o -MD -MP -MF $(DEPDIR)/libtowers2_a-towers.Tpo -c -o ./libtowers2_a-towers.o `test -f './towers.c' || echo '$(srcdir)/'`./towers.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libtowers2_a-towers.Tpo $(DEPDIR)/libtowers2_a-towers.Po
+#       $(AM_V_CC)source='./towers.c' object='./libtowers2_a-towers.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libtowers2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libtowers2_a-towers.o `test -f './towers.c' || echo '$(srcdir)/'`./towers.c
+
+./libtowers2_a-towers.obj: ./towers.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libtowers2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libtowers2_a-towers.obj -MD -MP -MF $(DEPDIR)/libtowers2_a-towers.Tpo -c -o ./libtowers2_a-towers.obj `if test -f './towers.c'; then $(CYGPATH_W) './towers.c'; else $(CYGPATH_W) '$(srcdir)/./towers.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libtowers2_a-towers.Tpo $(DEPDIR)/libtowers2_a-towers.Po
+#       $(AM_V_CC)source='./towers.c' object='./libtowers2_a-towers.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libtowers2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libtowers2_a-towers.obj `if test -f './towers.c'; then $(CYGPATH_W) './towers.c'; else $(CYGPATH_W) '$(srcdir)/./towers.c'; fi`
+
+./libunequal2_a-unequal.o: ./unequal.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libunequal2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libunequal2_a-unequal.o -MD -MP -MF $(DEPDIR)/libunequal2_a-unequal.Tpo -c -o ./libunequal2_a-unequal.o `test -f './unequal.c' || echo '$(srcdir)/'`./unequal.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libunequal2_a-unequal.Tpo $(DEPDIR)/libunequal2_a-unequal.Po
+#       $(AM_V_CC)source='./unequal.c' object='./libunequal2_a-unequal.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libunequal2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libunequal2_a-unequal.o `test -f './unequal.c' || echo '$(srcdir)/'`./unequal.c
+
+./libunequal2_a-unequal.obj: ./unequal.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libunequal2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libunequal2_a-unequal.obj -MD -MP -MF $(DEPDIR)/libunequal2_a-unequal.Tpo -c -o ./libunequal2_a-unequal.obj `if test -f './unequal.c'; then $(CYGPATH_W) './unequal.c'; else $(CYGPATH_W) '$(srcdir)/./unequal.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libunequal2_a-unequal.Tpo $(DEPDIR)/libunequal2_a-unequal.Po
+#       $(AM_V_CC)source='./unequal.c' object='./libunequal2_a-unequal.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libunequal2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libunequal2_a-unequal.obj `if test -f './unequal.c'; then $(CYGPATH_W) './unequal.c'; else $(CYGPATH_W) '$(srcdir)/./unequal.c'; fi`
+
+./libunruly2_a-unruly.o: ./unruly.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libunruly2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libunruly2_a-unruly.o -MD -MP -MF $(DEPDIR)/libunruly2_a-unruly.Tpo -c -o ./libunruly2_a-unruly.o `test -f './unruly.c' || echo '$(srcdir)/'`./unruly.c
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libunruly2_a-unruly.Tpo $(DEPDIR)/libunruly2_a-unruly.Po
+#       $(AM_V_CC)source='./unruly.c' object='./libunruly2_a-unruly.o' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libunruly2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libunruly2_a-unruly.o `test -f './unruly.c' || echo '$(srcdir)/'`./unruly.c
+
+./libunruly2_a-unruly.obj: ./unruly.c
+        $(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libunruly2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT ./libunruly2_a-unruly.obj -MD -MP -MF $(DEPDIR)/libunruly2_a-unruly.Tpo -c -o ./libunruly2_a-unruly.obj `if test -f './unruly.c'; then $(CYGPATH_W) './unruly.c'; else $(CYGPATH_W) '$(srcdir)/./unruly.c'; fi`
+        $(AM_V_at)$(am__mv) $(DEPDIR)/libunruly2_a-unruly.Tpo $(DEPDIR)/libunruly2_a-unruly.Po
+#       $(AM_V_CC)source='./unruly.c' object='./libunruly2_a-unruly.obj' libtool=no \
+#       DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) \
+#       $(AM_V_CC_no)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libunruly2_a_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o ./libunruly2_a-unruly.obj `if test -f './unruly.c'; then $(CYGPATH_W) './unruly.c'; else $(CYGPATH_W) '$(srcdir)/./unruly.c'; fi`
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+distcleancheck: distclean
+        @if test '$(srcdir)' = . ; then \
+          echo "ERROR: distcleancheck can only run from a VPATH build" ; \
+          exit 1 ; \
+        fi
+        @test `$(distcleancheck_listfiles) | wc -l` -eq 0 \
+          || { echo "ERROR: files left in build directory after distclean:" ; \
+               $(distcleancheck_listfiles) ; \
+               exit 1; } >&2
+check-am: all-am
+check: check-am
+all-am: Makefile $(LIBRARIES) $(PROGRAMS)
+installdirs:
+        for dir in "$(DESTDIR)$(bindir)"; do \
+          test -z "$$dir" || $(MKDIR_P) "$$dir"; \
         done
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+        @$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+        if test -z '$(STRIP)'; then \
+          $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+            install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+              install; \
+        else \
+          $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+            install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+            "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+        fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+        -test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+        -test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+        -rm -f ./$(am__dirstamp)
+        -test -z "$(DEPDIR)/$(am__dirstamp)" || rm -f $(DEPDIR)/$(am__dirstamp)
+
+maintainer-clean-generic:
+        @echo "This command is intended for maintainers to use"
+        @echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-binPROGRAMS clean-generic clean-noinstLIBRARIES \
+        clean-noinstPROGRAMS mostlyclean-am
+
+distclean: distclean-am
+        -rm -f $(am__CONFIG_DISTCLEAN_FILES)
+        -rm -rf ./$(DEPDIR)
+        -rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+        distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am: install-binPROGRAMS
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+        -rm -f $(am__CONFIG_DISTCLEAN_FILES)
+        -rm -rf $(top_srcdir)/autom4te.cache
+        -rm -rf ./$(DEPDIR)
+        -rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-binPROGRAMS
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--refresh check check-am clean \
+        clean-binPROGRAMS clean-cscope clean-generic \
+        clean-noinstLIBRARIES clean-noinstPROGRAMS cscope \
+        cscopelist-am ctags ctags-am dist dist-all dist-bzip2 \
+        dist-gzip dist-lzip dist-shar dist-tarZ dist-xz dist-zip \
+        distcheck distclean distclean-compile distclean-generic \
+        distclean-tags distcleancheck distdir distuninstallcheck dvi \
+        dvi-am html html-am info info-am install install-am \
+        install-binPROGRAMS install-data install-data-am install-dvi \
+        install-dvi-am install-exec install-exec-am install-html \
+        install-html-am install-info install-info-am install-man \
+        install-pdf install-pdf-am install-ps install-ps-am \
+        install-strip installcheck installcheck-am installdirs \
+        maintainer-clean maintainer-clean-generic mostlyclean \
+        mostlyclean-compile mostlyclean-generic pdf pdf-am ps ps-am \
+        tags tags-am uninstall uninstall-am uninstall-binPROGRAMS
+
+.PRECIOUS: Makefile
+
 test: benchmark.html benchmark.txt
 
 benchmark.html: benchmark.txt benchmark.pl
@@ -722,6 +2606,6 @@ benchmark.html: benchmark.txt benchmark.pl
 benchmark.txt: benchmark.sh $(GAMES)
         ./benchmark.sh > $@
 
-
-clean:
-        rm -f *.o $(BINPREFIX)blackbox $(BINPREFIX)bridges $(BINPREFIX)cube $(BINPREFIX)dominosa $(BINPREFIX)fifteen $(BINPREFIX)fifteensolver $(BINPREFIX)filling $(BINPREFIX)fillingsolver $(BINPREFIX)flip $(BINPREFIX)flood $(BINPREFIX)galaxies $(BINPREFIX)galaxiespicture $(BINPREFIX)galaxiessolver $(BINPREFIX)guess $(BINPREFIX)inertia $(BINPREFIX)keen $(BINPREFIX)keensolver $(BINPREFIX)latincheck $(BINPREFIX)lightup $(BINPREFIX)lightupsolver $(BINPREFIX)loopy $(BINPREFIX)loopysolver $(BINPREFIX)magnets $(BINPREFIX)magnetssolver $(BINPREFIX)map $(BINPREFIX)mapsolver $(BINPREFIX)mineobfusc $(BINPREFIX)mines $(BINPREFIX)net $(BINPREFIX)netslide $(BINPREFIX)nullgame $(BINPREFIX)obfusc $(BINPREFIX)palisade $(BINPREFIX)pattern $(BINPREFIX)patternpicture $(BINPREFIX)patternsolver $(BINPREFIX)pearl $(BINPREFIX)pearlbench $(BINPREFIX)pegs $(BINPREFIX)range $(BINPREFIX)rect $(BINPREFIX)samegame $(BINPREFIX)signpost $(BINPREFIX)signpostsolver $(BINPREFIX)singles $(BINPREFIX)singlessolver $(BINPREFIX)sixteen $(BINPREFIX)slant $(BINPREFIX)slantsolver $(BINPREFIX)solo $(BINPREFIX)solosolver $(BINPREFIX)tents $(BINPREFIX)tentssolver $(BINPREFIX)towers $(BINPREFIX)towerssolver $(BINPREFIX)tracks $(BINPREFIX)twiddle $(BINPREFIX)undead $(BINPREFIX)unequal $(BINPREFIX)unequalsolver $(BINPREFIX)unruly $(BINPREFIX)unrulysolver $(BINPREFIX)untangle
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/apps/plugins/puzzles/src/Makefile.in b/apps/plugins/puzzles/src/Makefile.in
index b86194f893..58154a8d74 100644
--- a/apps/plugins/puzzles/src/Makefile.in
+++ b/apps/plugins/puzzles/src/Makefile.in
@@ -1,7 +1,7 @@
-# Makefile.in generated by automake 1.15 from Makefile.am.
+# Makefile.in generated by automake 1.15.1 from Makefile.am.
 # @configure_input@
 
-# Copyright (C) 1994-2014 Free Software Foundation, Inc.
+# Copyright (C) 1994-2017 Free Software Foundation, Inc.
 
 # This Makefile.in is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/apps/plugins/puzzles/src/aclocal.m4 b/apps/plugins/puzzles/src/aclocal.m4
index 6e4efedfb6..04369a2130 100644
--- a/apps/plugins/puzzles/src/aclocal.m4
+++ b/apps/plugins/puzzles/src/aclocal.m4
@@ -1,6 +1,6 @@
-# generated automatically by aclocal 1.15 -*- Autoconf -*-
+# generated automatically by aclocal 1.15.1 -*- Autoconf -*-
 
-# Copyright (C) 1996-2014 Free Software Foundation, Inc.
+# Copyright (C) 1996-2017 Free Software Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -424,9 +424,9 @@ AC_DEFUN([GTK_CHECK_BACKEND],
   fi
 ])
 
-dnl pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
-dnl serial 11 (pkg-config-0.29.1)
-dnl
+# pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
+# serial 12 (pkg-config-0.29.2)
+
 dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
 dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
 dnl
@@ -467,7 +467,7 @@ dnl
 dnl See the "Since" comment for each macro you use to see what version
 dnl of the macros you require.
 m4_defun([PKG_PREREQ],
-[m4_define([PKG_MACROS_VERSION], [0.29.1])
+[m4_define([PKG_MACROS_VERSION], [0.29.2])
 m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
     [m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
 ])dnl PKG_PREREQ
@@ -568,7 +568,7 @@ AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
 AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
 
 pkg_failed=no
-AC_MSG_CHECKING([for $1])
+AC_MSG_CHECKING([for $2])
 
 _PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
 _PKG_CONFIG([$1][_LIBS], [libs], [$2])
@@ -578,11 +578,11 @@ and $1[]_LIBS to avoid the need to call pkg-config.
 See the pkg-config man page for more details.])
 
 if test $pkg_failed = yes; then
-        AC_MSG_RESULT([no])
+        AC_MSG_RESULT([no])
         _PKG_SHORT_ERRORS_SUPPORTED
         if test $_pkg_short_errors_supported = yes; then
                 $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1`
-        else 
+        else
                 $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1`
         fi
         # Put the nasty error message in config.log where it belongs
@@ -599,7 +599,7 @@ installed software in a non-standard prefix.
 _PKG_TEXT])[]dnl
         ])
 elif test $pkg_failed = untried; then
-        AC_MSG_RESULT([no])
+        AC_MSG_RESULT([no])
         m4_default([$4], [AC_MSG_FAILURE(
 [The pkg-config script could not be found or is too old.  Make sure it
 is in your PATH or set the PKG_CONFIG environment variable to the full
@@ -700,7 +700,7 @@ AS_VAR_COPY([$1], [pkg_cv_][$1])
 AS_VAR_IF([$1], [""], [$5], [$4])dnl
 ])dnl PKG_CHECK_VAR
 
-# Copyright (C) 2002-2014 Free Software Foundation, Inc.
+# Copyright (C) 2002-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -715,7 +715,7 @@ AC_DEFUN([AM_AUTOMAKE_VERSION],
 [am__api_version='1.15'
 dnl Some users find AM_AUTOMAKE_VERSION and mistake it for a way to
 dnl require some minimum version.  Point them to the right macro.
-m4_if([$1], [1.15], [],
+m4_if([$1], [1.15.1], [],
       [AC_FATAL([Do not call $0, use AM_INIT_AUTOMAKE([$1]).])])dnl
 ])
 
@@ -731,14 +731,14 @@ m4_define([_AM_AUTOCONF_VERSION], [])
 # Call AM_AUTOMAKE_VERSION and AM_AUTOMAKE_VERSION so they can be traced.
 # This function is AC_REQUIREd by AM_INIT_AUTOMAKE.
 AC_DEFUN([AM_SET_CURRENT_AUTOMAKE_VERSION],
-[AM_AUTOMAKE_VERSION([1.15])dnl
+[AM_AUTOMAKE_VERSION([1.15.1])dnl
 m4_ifndef([AC_AUTOCONF_VERSION],
   [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
 _AM_AUTOCONF_VERSION(m4_defn([AC_AUTOCONF_VERSION]))])
 
 # AM_AUX_DIR_EXPAND                                         -*- Autoconf -*-
 
-# Copyright (C) 2001-2014 Free Software Foundation, Inc.
+# Copyright (C) 2001-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -790,7 +790,7 @@ am_aux_dir=`cd "$ac_aux_dir" && pwd`
 
 # AM_CONDITIONAL                                            -*- Autoconf -*-
 
-# Copyright (C) 1997-2014 Free Software Foundation, Inc.
+# Copyright (C) 1997-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -821,7 +821,7 @@ AC_CONFIG_COMMANDS_PRE(
 Usually this means the macro was only invoked conditionally.]])
 fi])])
 
-# Copyright (C) 1999-2014 Free Software Foundation, Inc.
+# Copyright (C) 1999-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1012,7 +1012,7 @@ _AM_SUBST_NOTMAKE([am__nodep])dnl
 
 # Generate code to set up dependency tracking.              -*- Autoconf -*-
 
-# Copyright (C) 1999-2014 Free Software Foundation, Inc.
+# Copyright (C) 1999-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1088,7 +1088,7 @@ AC_DEFUN([AM_OUTPUT_DEPENDENCY_COMMANDS],
 
 # Do all the work for Automake.                             -*- Autoconf -*-
 
-# Copyright (C) 1996-2014 Free Software Foundation, Inc.
+# Copyright (C) 1996-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1285,7 +1285,7 @@ for _am_header in $config_headers :; do
 done
 echo "timestamp for $_am_arg" >`AS_DIRNAME(["$_am_arg"])`/stamp-h[]$_am_stamp_count])
 
-# Copyright (C) 2001-2014 Free Software Foundation, Inc.
+# Copyright (C) 2001-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1306,7 +1306,7 @@ if test x"${install_sh+set}" != xset; then
 fi
 AC_SUBST([install_sh])])
 
-# Copyright (C) 2003-2014 Free Software Foundation, Inc.
+# Copyright (C) 2003-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1327,7 +1327,7 @@ AC_SUBST([am__leading_dot])])
 
 # Check to see how 'make' treats includes.                  -*- Autoconf -*-
 
-# Copyright (C) 2001-2014 Free Software Foundation, Inc.
+# Copyright (C) 2001-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1377,7 +1377,7 @@ rm -f confinc confmf
 
 # Fake the existence of programs that GNU maintainers use.  -*- Autoconf -*-
 
-# Copyright (C) 1997-2014 Free Software Foundation, Inc.
+# Copyright (C) 1997-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1416,7 +1416,7 @@ fi
 
 # Helper functions for option handling.                     -*- Autoconf -*-
 
-# Copyright (C) 2001-2014 Free Software Foundation, Inc.
+# Copyright (C) 2001-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1445,7 +1445,7 @@ AC_DEFUN([_AM_SET_OPTIONS],
 AC_DEFUN([_AM_IF_OPTION],
 [m4_ifset(_AM_MANGLE_OPTION([$1]), [$2], [$3])])
 
-# Copyright (C) 1999-2014 Free Software Foundation, Inc.
+# Copyright (C) 1999-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1492,7 +1492,7 @@ AC_LANG_POP([C])])
 # For backward compatibility.
 AC_DEFUN_ONCE([AM_PROG_CC_C_O], [AC_REQUIRE([AC_PROG_CC])])
 
-# Copyright (C) 2001-2014 Free Software Foundation, Inc.
+# Copyright (C) 2001-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1511,7 +1511,7 @@ AC_DEFUN([AM_RUN_LOG],
 
 # Check to make sure that the build environment is sane.    -*- Autoconf -*-
 
-# Copyright (C) 1996-2014 Free Software Foundation, Inc.
+# Copyright (C) 1996-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1592,7 +1592,7 @@ AC_CONFIG_COMMANDS_PRE(
 rm -f conftest.file
 ])
 
-# Copyright (C) 2009-2014 Free Software Foundation, Inc.
+# Copyright (C) 2009-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1652,7 +1652,7 @@ AC_SUBST([AM_BACKSLASH])dnl
 _AM_SUBST_NOTMAKE([AM_BACKSLASH])dnl
 ])
 
-# Copyright (C) 2001-2014 Free Software Foundation, Inc.
+# Copyright (C) 2001-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1680,7 +1680,7 @@ fi
 INSTALL_STRIP_PROGRAM="\$(install_sh) -c -s"
 AC_SUBST([INSTALL_STRIP_PROGRAM])])
 
-# Copyright (C) 2006-2014 Free Software Foundation, Inc.
+# Copyright (C) 2006-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -1699,7 +1699,7 @@ AC_DEFUN([AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE($@)])
 
 # Check how to create a tarball.                            -*- Autoconf -*-
 
-# Copyright (C) 2004-2014 Free Software Foundation, Inc.
+# Copyright (C) 2004-2017 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
diff --git a/apps/plugins/puzzles/src/blackbox.c b/apps/plugins/puzzles/src/blackbox.c
index 192b7f11b6..ffc7f7c587 100644
--- a/apps/plugins/puzzles/src/blackbox.c
+++ b/apps/plugins/puzzles/src/blackbox.c
@@ -148,14 +148,12 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "No. of balls";
     ret[2].type = C_STRING;
@@ -163,13 +161,10 @@ static config_item *game_configure(const game_params *params)
         sprintf(buf, "%d", params->minballs);
     else
         sprintf(buf, "%d-%d", params->minballs, params->maxballs);
-    ret[2].sval = dupstr(buf);
-    ret[2].ival = 0;
+    ret[2].u.string.sval = dupstr(buf);
 
     ret[3].name = NULL;
     ret[3].type = C_END;
-    ret[3].sval = NULL;
-    ret[3].ival = 0;
 
     return ret;
 }
@@ -178,17 +173,18 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
 
     /* Allow 'a-b' for a range, otherwise assume a single number. */
-    if (sscanf(cfg[2].sval, "%d-%d", &ret->minballs, &ret->maxballs) < 2)
-        ret->minballs = ret->maxballs = atoi(cfg[2].sval);
+    if (sscanf(cfg[2].u.string.sval, "%d-%d",
+               &ret->minballs, &ret->maxballs) < 2)
+        ret->minballs = ret->maxballs = atoi(cfg[2].u.string.sval);
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 2 || params->h < 2)
         return "Width and height must both be at least two";
@@ -253,11 +249,11 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int nballs, dlen = strlen(desc), i;
     unsigned char *bmp;
-    char *ret;
+    const char *ret;
 
     /* the bitmap is 2+(nballs*2) long; the hex version is double that. */
     nballs = ((dlen/2)-2)/2;
@@ -464,7 +460,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     return dupstr("S");
 }
@@ -904,7 +900,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         ui->cur_x = cx;
         ui->cur_y = cy;
         ui->cur_visible = 1;
-        return "";
+        return UI_UPDATE;
     }
 
     if (button == LEFT_BUTTON || button == RIGHT_BUTTON) {
@@ -914,7 +910,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         wouldflash = 1;
     } else if (button == LEFT_RELEASE) {
         ui->flash_laser = 0;
-        return "";
+        return UI_UPDATE;
     } else if (IS_CURSOR_SELECT(button)) {
         if (ui->cur_visible) {
             gx = ui->cur_x;
@@ -923,7 +919,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             wouldflash = 2;
         } else {
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
         /* Fix up 'button' for the below logic. */
         if (button == CURSOR_SELECT2) button = RIGHT_BUTTON;
@@ -972,9 +968,9 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             return nullret;
         ui->flash_laserno = rangeno;
         ui->flash_laser = wouldflash;
-        nullret = "";
+        nullret = UI_UPDATE;
         if (state->exits[rangeno] != LASER_EMPTY)
-            return "";
+            return UI_UPDATE;
         sprintf(buf, "F%d", rangeno);
         break;
 
diff --git a/apps/plugins/puzzles/src/bridges.c b/apps/plugins/puzzles/src/bridges.c
index 6975208fd6..0a326f2a42 100644
--- a/apps/plugins/puzzles/src/bridges.c
+++ b/apps/plugins/puzzles/src/bridges.c
@@ -742,44 +742,40 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Difficulty";
     ret[2].type = C_CHOICES;
-    ret[2].sval = ":Easy:Medium:Hard";
-    ret[2].ival = params->difficulty;
+    ret[2].u.choices.choicenames = ":Easy:Medium:Hard";
+    ret[2].u.choices.selected = params->difficulty;
 
     ret[3].name = "Allow loops";
     ret[3].type = C_BOOLEAN;
-    ret[3].sval = NULL;
-    ret[3].ival = params->allowloops;
+    ret[3].u.boolean.bval = params->allowloops;
 
     ret[4].name = "Max. bridges per direction";
     ret[4].type = C_CHOICES;
-    ret[4].sval = ":1:2:3:4"; /* keep up-to-date with MAX_BRIDGES */
-    ret[4].ival = params->maxb - 1;
+    ret[4].u.choices.choicenames = ":1:2:3:4"; /* keep up-to-date with
+                                                * MAX_BRIDGES */
+    ret[4].u.choices.selected = params->maxb - 1;
 
     ret[5].name = "%age of island squares";
     ret[5].type = C_CHOICES;
-    ret[5].sval = ":5%:10%:15%:20%:25%:30%";
-    ret[5].ival = (params->islands / 5)-1;
+    ret[5].u.choices.choicenames = ":5%:10%:15%:20%:25%:30%";
+    ret[5].u.choices.selected = (params->islands / 5)-1;
 
     ret[6].name = "Expansion factor (%age)";
     ret[6].type = C_CHOICES;
-    ret[6].sval = ":0%:10%:20%:30%:40%:50%:60%:70%:80%:90%:100%";
-    ret[6].ival = params->expansion / 10;
+    ret[6].u.choices.choicenames = ":0%:10%:20%:30%:40%:50%:60%:70%:80%:90%:100%";
+    ret[6].u.choices.selected = params->expansion / 10;
 
     ret[7].name = NULL;
     ret[7].type = C_END;
-    ret[7].sval = NULL;
-    ret[7].ival = 0;
 
     return ret;
 }
@@ -788,18 +784,18 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w          = atoi(cfg[0].sval);
-    ret->h          = atoi(cfg[1].sval);
-    ret->difficulty = cfg[2].ival;
-    ret->allowloops = cfg[3].ival;
-    ret->maxb       = cfg[4].ival + 1;
-    ret->islands    = (cfg[5].ival + 1) * 5;
-    ret->expansion  = cfg[6].ival * 10;
+    ret->w          = atoi(cfg[0].u.string.sval);
+    ret->h          = atoi(cfg[1].u.string.sval);
+    ret->difficulty = cfg[2].u.choices.selected;
+    ret->allowloops = cfg[3].u.boolean.bval;
+    ret->maxb       = cfg[4].u.choices.selected + 1;
+    ret->islands    = (cfg[5].u.choices.selected + 1) * 5;
+    ret->expansion  = cfg[6].u.choices.selected * 10;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 3 || params->h < 3)
         return "Width and height must be at least 3";
@@ -1993,7 +1989,7 @@ generated:
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int i, wh = params->w * params->h;
 
@@ -2094,7 +2090,7 @@ static char *ui_cancel_drag(game_ui *ui)
     ui->dragx_src = ui->dragy_src = -1;
     ui->dragx_dst = ui->dragy_dst = -1;
     ui->dragging = 0;
-    return "";
+    return UI_UPDATE;
 }
 
 static game_ui *new_ui(const game_state *state)
@@ -2282,7 +2278,7 @@ static char *update_drag_dst(const game_state *state, game_ui *ui,
     /*debug(("update_drag src (%d,%d) d(%d,%d) dst (%d,%d)\n",
            ui->dragx_src, ui->dragy_src, dx, dy,
            ui->dragx_dst, ui->dragy_dst));*/
-    return "";
+    return UI_UPDATE;
 }
 
 static char *finish_drag(const game_state *state, game_ui *ui)
@@ -2325,7 +2321,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         if (ggrid & G_ISLAND) {
             ui->dragx_src = gx;
             ui->dragy_src = gy;
-            return "";
+            return UI_UPDATE;
         } else
             return ui_cancel_drag(ui);
     } else if (button == LEFT_DRAG || button == RIGHT_DRAG) {
@@ -2339,7 +2335,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             /* cancel a drag when we go back to the starting point */
             ui->dragx_dst = -1;
             ui->dragy_dst = -1;
-            return "";
+            return UI_UPDATE;
         }
     } else if (button == LEFT_RELEASE || button == RIGHT_RELEASE) {
         if (ui->dragging) {
@@ -2424,19 +2420,19 @@ static char *interpret_move(const game_state *state, game_ui *ui,
 
                     if (!dingrid) break;
                 }
-                if (!oingrid) return "";
+                if (!oingrid) return UI_UPDATE;
             }
             /* not reached */
 
 found:
             ui->cur_x = nx;
             ui->cur_y = ny;
-            return "";
+            return UI_UPDATE;
         }
     } else if (IS_CURSOR_SELECT(button)) {
         if (!ui->cur_visible) {
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
         if (ui->dragging || button == CURSOR_SELECT2) {
             ui_cancel_drag(ui);
@@ -2444,7 +2440,7 @@ found:
                 sprintf(buf, "M%d,%d", ui->cur_x, ui->cur_y);
                 return dupstr(buf);
             } else
-                return "";
+                return UI_UPDATE;
         } else {
             grid_type v = GRID(state, ui->cur_x, ui->cur_y);
             if (v & G_ISLAND) {
@@ -2453,7 +2449,7 @@ found:
                 ui->dragy_src = ui->cur_y;
                 ui->dragx_dst = ui->dragy_dst = -1;
                 ui->drag_is_noline = (button == CURSOR_SELECT2) ? 1 : 0;
-                return "";
+                return UI_UPDATE;
             }
         }
     } else if ((button >= '0' && button <= '9') ||
@@ -2471,7 +2467,7 @@ found:
 
         if (!ui->cur_visible) {
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
 
         for (i = 0; i < state->n_islands; ++i) {
@@ -2498,12 +2494,12 @@ found:
         if (best_x != -1 && best_y != -1) {
             ui->cur_x = best_x;
             ui->cur_y = best_y;
-            return "";
+            return UI_UPDATE;
         } else
             return NULL;
     } else if (button == 'g' || button == 'G') {
         ui->show_hints = 1 - ui->show_hints;
-        return "";
+        return UI_UPDATE;
     }
 
     return NULL;
@@ -2577,7 +2573,7 @@ badmove:
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     char *ret;
     game_state *solved;
diff --git a/apps/plugins/puzzles/src/combi.c b/apps/plugins/puzzles/src/combi.c
index 4c5d1077aa..3460183c9c 100644
--- a/apps/plugins/puzzles/src/combi.c
+++ b/apps/plugins/puzzles/src/combi.c
@@ -79,7 +79,7 @@ void free_combi(combi_ctx *combi)
 
 #include <stdio.h>
 
-void fatal(char *fmt, ...)
+void fatal(const char *fmt, ...)
 {
     abort();
 }
diff --git a/apps/plugins/puzzles/src/config.log b/apps/plugins/puzzles/src/config.log
index 8bf125c515..b44728f053 100644
--- a/apps/plugins/puzzles/src/config.log
+++ b/apps/plugins/puzzles/src/config.log
@@ -4,7 +4,7 @@ running configure, to aid debugging if configure makes a mistake.
 It was created by puzzles configure 6.66, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
-  $ ./configure 
+  $ ./configure --no-create --no-recursion
 
 ## --------- ##
 ## Platform. ##
@@ -12,9 +12,9 @@ generated by GNU Autoconf 2.69.  Invocation command line was
 
 hostname = alpha
 uname -m = x86_64
-uname -r = 4.8.4-1-ARCH
+uname -r = 4.11.9-1-ARCH
 uname -s = Linux
-uname -v = #1 SMP PREEMPT Sat Oct 22 18:26:57 CEST 2016
+uname -v = #1 SMP PREEMPT Wed Jul 5 18:23:08 CEST 2017
 
 /usr/bin/uname -p = unknown
 /bin/uname -X     = unknown
@@ -42,11 +42,241 @@ PATH: /usr/bin/core_perl
 ## Core tests. ##
 ## ----------- ##
 
+configure:1943: checking for a BSD-compatible install
+configure:2011: result: /usr/bin/install -c
+configure:2022: checking whether build environment is sane
+configure:2077: result: yes
+configure:2228: checking for a thread-safe mkdir -p
+configure:2267: result: /usr/bin/mkdir -p
+configure:2274: checking for gawk
+configure:2290: found /usr/bin/gawk
+configure:2301: result: gawk
+configure:2312: checking whether make sets $(MAKE)
+configure:2334: result: yes
+configure:2363: checking whether make supports nested variables
+configure:2380: result: yes
+configure:2554: checking for gcc
+configure:2570: found /usr/bin/gcc
+configure:2581: result: gcc
+configure:2810: checking for C compiler version
+configure:2819: gcc --version >&5
+gcc (GCC) 7.2.0
+Copyright (C) 2017 Free Software Foundation, Inc.
+This is free software; see the source for copying conditions.  There is NO
+warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+configure:2830: $? = 0
+configure:2819: gcc -v >&5
+Using built-in specs.
+COLLECT_GCC=gcc
+COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/7.2.0/lto-wrapper
+Target: x86_64-pc-linux-gnu
+Configured with: /build/gcc-multilib/src/gcc/configure --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/ --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ --enable-shared --enable-threads=posix --enable-libmpx --with-system-zlib --with-isl --enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object --enable-linker-build-id --enable-lto --enable-plugin --enable-install-libiberty --with-linker-hash-style=gnu --enable-gnu-indirect-function --enable-multilib --disable-werror --enable-checking=release --enable-default-pie --enable-default-ssp
+Thread model: posix
+gcc version 7.2.0 (GCC) 
+configure:2830: $? = 0
+configure:2819: gcc -V >&5
+gcc: error: unrecognized command line option '-V'
+gcc: fatal error: no input files
+compilation terminated.
+configure:2830: $? = 1
+configure:2819: gcc -qversion >&5
+gcc: error: unrecognized command line option '-qversion'; did you mean '--version'?
+gcc: fatal error: no input files
+compilation terminated.
+configure:2830: $? = 1
+configure:2850: checking whether the C compiler works
+configure:2872: gcc    conftest.c  >&5
+configure:2876: $? = 0
+configure:2924: result: yes
+configure:2927: checking for C compiler default output file name
+configure:2929: result: a.out
+configure:2935: checking for suffix of executables
+configure:2942: gcc -o conftest    conftest.c  >&5
+configure:2946: $? = 0
+configure:2968: result: 
+configure:2990: checking whether we are cross compiling
+configure:2998: gcc -o conftest    conftest.c  >&5
+configure:3002: $? = 0
+configure:3009: ./conftest
+configure:3013: $? = 0
+configure:3028: result: no
+configure:3033: checking for suffix of object files
+configure:3055: gcc -c   conftest.c >&5
+configure:3059: $? = 0
+configure:3080: result: o
+configure:3084: checking whether we are using the GNU C compiler
+configure:3103: gcc -c   conftest.c >&5
+configure:3103: $? = 0
+configure:3112: result: yes
+configure:3121: checking whether gcc accepts -g
+configure:3141: gcc -c -g  conftest.c >&5
+configure:3141: $? = 0
+configure:3182: result: yes
+configure:3199: checking for gcc option to accept ISO C89
+configure:3262: gcc  -c -g -O2  conftest.c >&5
+configure:3262: $? = 0
+configure:3275: result: none needed
+configure:3300: checking whether gcc understands -c and -o together
+configure:3322: gcc -c conftest.c -o conftest2.o
+configure:3325: $? = 0
+configure:3322: gcc -c conftest.c -o conftest2.o
+configure:3325: $? = 0
+configure:3337: result: yes
+configure:3365: checking for style of include used by make
+configure:3393: result: GNU
+configure:3419: checking dependency style of gcc
+configure:3530: result: gcc3
+configure:3591: checking for pkg-config
+configure:3609: found /usr/bin/pkg-config
+configure:3622: result: /usr/bin/pkg-config
+configure:3643: checking for GTK+ - version >= 3.0.0
+configure:3750: gcc -o conftest -g -O2 -pthread -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/freetype2 -I/usr/include/harfbuzz -I/usr/include/libdrm -I/usr/include/libpng16 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include   conftest.c -lgtk-3 -lgdk-3 -lpangocairo-1.0 -lpango-1.0 -latk-1.0 -lcairo-gobject -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -lglib-2.0  >&5
+configure:3750: $? = 0
+configure:3750: ./conftest
+configure:3750: $? = 0
+configure:3764: result: yes (version 3.22.16)
+configure:4287: checking for usable gcc warning flags
+configure:4330: gcc -c -g -O2 -Wall -pthread -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/freetype2 -I/usr/include/harfbuzz -I/usr/include/libdrm -I/usr/include/libpng16 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include  conftest.c >&5
+configure:4330: $? = 0
+configure:4330: gcc -c -g -O2 -Wall -Werror -pthread -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/freetype2 -I/usr/include/harfbuzz -I/usr/include/libdrm -I/usr/include/libpng16 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include  conftest.c >&5
+configure:4330: $? = 0
+configure:4330: gcc -c -g -O2 -Wall -Werror -std=c89 -pthread -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/freetype2 -I/usr/include/harfbuzz -I/usr/include/libdrm -I/usr/include/libpng16 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include  conftest.c >&5
+configure:4330: $? = 0
+configure:4330: gcc -c -g -O2 -Wall -Werror -std=c89 -pedantic -pthread -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/freetype2 -I/usr/include/harfbuzz -I/usr/include/libdrm -I/usr/include/libpng16 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include  conftest.c >&5
+In file included from /usr/lib/glib-2.0/include/glibconfig.h:9:0,
+                 from /usr/include/glib-2.0/glib/gtypes.h:32,
+                 from /usr/include/glib-2.0/glib/galloca.h:32,
+                 from /usr/include/glib-2.0/glib.h:30,
+                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
+                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
+                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
+                 from conftest.c:24:
+/usr/include/glib-2.0/glib/gtypes.h: In function '_GLIB_CHECKED_ADD_U64':
+/usr/include/glib-2.0/glib/gtypes.h:423:41: error: ISO C90 does not support 'long long' [-Werror=long-long]
+   G_STATIC_ASSERT(sizeof (unsigned long long) == sizeof (guint64));
+                                         ^
+/usr/include/glib-2.0/glib/gmacros.h:232:104: note: in definition of macro 'G_STATIC_ASSERT'
+ #define G_STATIC_ASSERT(expr) typedef char G_PASTE (_GStaticAssertCompileTimeAssertion_, __COUNTER__)[(expr) ? 1 : -1] G_GNUC_UNUSED
+                                                                                                        ^~~~
+In file included from /usr/include/glib-2.0/glib/galloca.h:32:0,
+                 from /usr/include/glib-2.0/glib.h:30,
+                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
+                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
+                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
+                 from conftest.c:24:
+/usr/include/glib-2.0/glib/gtypes.h:424:58: error: ISO C90 does not support 'long long' [-Werror=long-long]
+   return !__builtin_uaddll_overflow(a, b, (unsigned long long *) dest); }
+                                                          ^~~~
+/usr/include/glib-2.0/glib/gtypes.h: In function '_GLIB_CHECKED_MUL_U64':
+/usr/include/glib-2.0/glib/gtypes.h:426:58: error: ISO C90 does not support 'long long' [-Werror=long-long]
+   return !__builtin_umulll_overflow(a, b, (unsigned long long *) dest); }
+                                                          ^~~~
+In file included from /usr/include/glib-2.0/glib.h:62:0,
+                 from /usr/include/gtk-3.0/gdk/gdkconfig.h:13,
+                 from /usr/include/gtk-3.0/gdk/gdk.h:30,
+                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
+                 from conftest.c:24:
+/usr/include/glib-2.0/glib/gmessages.h: At top level:
+/usr/include/glib-2.0/glib/gmessages.h:136:29: error: comma at end of enumerator list [-Werror=pedantic]
+   G_LOG_WRITER_UNHANDLED = 0,
+                             ^
+/usr/include/glib-2.0/glib/gmessages.h:322:17: error: anonymous variadic macros were introduced in C99 [-Werror=variadic-macros]
+ #define g_error(...)  G_STMT_START {                 \
+                 ^~~
+/usr/include/glib-2.0/glib/gmessages.h:328:19: error: anonymous variadic macros were introduced in C99 [-Werror=variadic-macros]
+ #define g_message(...)  g_log (G_LOG_DOMAIN,         \
+                   ^~~
+/usr/include/glib-2.0/glib/gmessages.h:331:20: error: anonymous variadic macros were introduced in C99 [-Werror=variadic-macros]
+ #define g_critical(...) g_log (G_LOG_DOMAIN,         \
+                    ^~~
+/usr/include/glib-2.0/glib/gmessages.h:334:19: error: anonymous variadic macros were introduced in C99 [-Werror=variadic-macros]
+ #define g_warning(...)  g_log (G_LOG_DOMAIN,         \
+                   ^~~
+/usr/include/glib-2.0/glib/gmessages.h:337:16: error: anonymous variadic macros were introduced in C99 [-Werror=variadic-macros]
+ #define g_info(...)     g_log (G_LOG_DOMAIN,         \
+                ^~~
+/usr/include/glib-2.0/glib/gmessages.h:340:17: error: anonymous variadic macros were introduced in C99 [-Werror=variadic-macros]
+ #define g_debug(...)    g_log (G_LOG_DOMAIN,         \
+                 ^~~
+In file included from /usr/include/gtk-3.0/gdk/gdkapplaunchcontext.h:30:0,
+                 from /usr/include/gtk-3.0/gdk/gdk.h:32,
+                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
+                 from conftest.c:24:
+/usr/include/gtk-3.0/gdk/gdktypes.h:319:39: error: comma at end of enumerator list [-Werror=pedantic]
+   GDK_MODIFIER_INTENT_DEFAULT_MOD_MASK,
+                                       ^
+/usr/include/gtk-3.0/gdk/gdktypes.h:597:48: error: comma at end of enumerator list [-Werror=pedantic]
+   GDK_AXIS_FLAG_SLIDER   = 1 << GDK_AXIS_SLIDER,
+                                                ^
+In file included from /usr/include/gtk-3.0/gdk/gdkevents.h:36:0,
+                 from /usr/include/gtk-3.0/gdk/gdkdisplay.h:31,
+                 from /usr/include/gtk-3.0/gdk/gdkscreen.h:32,
+                 from /usr/include/gtk-3.0/gdk/gdkapplaunchcontext.h:31,
+                 from /usr/include/gtk-3.0/gdk/gdk.h:32,
+                 from /usr/include/gtk-3.0/gtk/gtk.h:30,
+                 from conftest.c:24:
+/usr/include/gtk-3.0/gdk/gdkdevicetool.h:61:28: error: comma at end of enumerator list [-Werror=pedantic]
+   GDK_DEVICE_TOOL_TYPE_LENS,
+                            ^
+cc1: all warnings being treated as errors
+configure:4330: $? = 1
+configure: failed program was:
+| /* confdefs.h */
+| #define PACKAGE_NAME "puzzles"
+| #define PACKAGE_TARNAME "puzzles"
+| #define PACKAGE_VERSION "6.66"
+| #define PACKAGE_STRING "puzzles 6.66"
+| #define PACKAGE_BUGREPORT "anakin@pobox.com"
+| #define PACKAGE_URL ""
+| #define PACKAGE "puzzles"
+| #define VERSION "6.66"
+| /* end confdefs.h.  */
+| 
+|         #include <stdio.h>
+|         #include <assert.h>
+|         #include <stdlib.h>
+|         #include <time.h>
+|         #include <stdarg.h>
+|         #include <string.h>
+|         #include <errno.h>
+|         #include <math.h>
+| 
+|         #include <sys/time.h>
+|         #include <sys/resource.h>
+| 
+|         #include <gtk/gtk.h>
+|         #include <gdk/gdkkeysyms.h>
+| 
+|         #include <gdk-pixbuf/gdk-pixbuf.h>
+| 
+|         #include <gdk/gdkx.h>
+|         #include <X11/Xlib.h>
+|         #include <X11/Xutil.h>
+|         #include <X11/Xatom.h>
+| 
+| int
+| main ()
+| {
+| 
+|         return 0;
+| 
+|   ;
+|   return 0;
+| }
+configure:4337: result:  -Wall -Werror -std=c89
+configure:4385: checking for ranlib
+configure:4401: found /usr/bin/ranlib
+configure:4412: result: ranlib
+configure:4582: checking that generated files are newer than configure
+configure:4588: result: done
+configure:4611: creating ./config.status
 
 ## ---------------- ##
 ## Cache variables. ##
 ## ---------------- ##
 
+ac_cv_c_compiler_gnu=yes
 ac_cv_env_CC_set=
 ac_cv_env_CC_value=
 ac_cv_env_CFLAGS_set=
@@ -57,33 +287,74 @@ ac_cv_env_LDFLAGS_set=
 ac_cv_env_LDFLAGS_value=
 ac_cv_env_LIBS_set=
 ac_cv_env_LIBS_value=
+ac_cv_env_PKG_CONFIG_LIBDIR_set=
+ac_cv_env_PKG_CONFIG_LIBDIR_value=
+ac_cv_env_PKG_CONFIG_PATH_set=
+ac_cv_env_PKG_CONFIG_PATH_value=
+ac_cv_env_PKG_CONFIG_set=
+ac_cv_env_PKG_CONFIG_value=
 ac_cv_env_build_alias_set=
 ac_cv_env_build_alias_value=
 ac_cv_env_host_alias_set=
 ac_cv_env_host_alias_value=
 ac_cv_env_target_alias_set=
 ac_cv_env_target_alias_value=
+ac_cv_objext=o
+ac_cv_path_PKG_CONFIG=/usr/bin/pkg-config
+ac_cv_path_install='/usr/bin/install -c'
+ac_cv_path_mkdir=/usr/bin/mkdir
+ac_cv_prog_AWK=gawk
+ac_cv_prog_ac_ct_CC=gcc
+ac_cv_prog_ac_ct_RANLIB=ranlib
+ac_cv_prog_cc_c89=
+ac_cv_prog_cc_g=yes
+ac_cv_prog_make_make_set=yes
+am_cv_CC_dependencies_compiler_type=gcc3
+am_cv_make_support_nested_variables=yes
+am_cv_prog_cc_c_o=yes
 
 ## ----------------- ##
 ## Output variables. ##
 ## ----------------- ##
 
-CC=''
-CFLAGS=''
+ACLOCAL='${SHELL} /home/franklin/puzzles/missing aclocal-1.15'
+AMDEPBACKSLASH='\'
+AMDEP_FALSE='#'
+AMDEP_TRUE=''
+AMTAR='$${TAR-tar}'
+AM_BACKSLASH='\'
+AM_DEFAULT_V='$(AM_DEFAULT_VERBOSITY)'
+AM_DEFAULT_VERBOSITY='1'
+AM_V='$(V)'
+AUTOCONF='${SHELL} /home/franklin/puzzles/missing autoconf'
+AUTOHEADER='${SHELL} /home/franklin/puzzles/missing autoheader'
+AUTOMAKE='${SHELL} /home/franklin/puzzles/missing automake-1.15'
+AWK='gawk'
+CC='gcc'
+CCDEPMODE='depmode=gcc3'
+CFLAGS='-g -O2 -Wall -Werror -std=c89'
 CPPFLAGS=''
-DEFS=''
+CYGPATH_W='echo'
+DEFS='-DPACKAGE_NAME=\"puzzles\" -DPACKAGE_TARNAME=\"puzzles\" -DPACKAGE_VERSION=\"6.66\" -DPACKAGE_STRING=\"puzzles\ 6.66\" -DPACKAGE_BUGREPORT=\"anakin@pobox.com\" -DPACKAGE_URL=\"\" -DPACKAGE=\"puzzles\" -DVERSION=\"6.66\"'
+DEPDIR='.deps'
 ECHO_C=''
 ECHO_N='-n'
 ECHO_T=''
 EXEEXT=''
-INSTALL_DATA=''
-INSTALL_PROGRAM=''
-INSTALL_SCRIPT=''
+GTK_CFLAGS='-pthread -I/usr/include/gtk-3.0 -I/usr/include/at-spi2-atk/2.0 -I/usr/include/at-spi-2.0 -I/usr/include/dbus-1.0 -I/usr/lib/dbus-1.0/include -I/usr/include/gtk-3.0 -I/usr/include/gio-unix-2.0/ -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/harfbuzz -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/freetype2 -I/usr/include/harfbuzz -I/usr/include/libdrm -I/usr/include/libpng16 -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/libpng16 -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include'
+GTK_LIBS='-lgtk-3 -lgdk-3 -lpangocairo-1.0 -lpango-1.0 -latk-1.0 -lcairo-gobject -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -lglib-2.0'
+INSTALL_DATA='${INSTALL} -m 644'
+INSTALL_PROGRAM='${INSTALL}'
+INSTALL_SCRIPT='${INSTALL}'
+INSTALL_STRIP_PROGRAM='$(install_sh) -c -s'
 LDFLAGS=''
 LIBOBJS=''
 LIBS=''
 LTLIBOBJS=''
-OBJEXT=''
+MAKEINFO='${SHELL} /home/franklin/puzzles/missing makeinfo'
+MKDIR_P='/usr/bin/mkdir -p'
+OBJEXT='o'
+PACKAGE='puzzles'
 PACKAGE_BUGREPORT='anakin@pobox.com'
 PACKAGE_NAME='puzzles'
 PACKAGE_STRING='puzzles 6.66'
@@ -91,28 +362,47 @@ PACKAGE_TARNAME='puzzles'
 PACKAGE_URL=''
 PACKAGE_VERSION='6.66'
 PATH_SEPARATOR=':'
-RANLIB=''
+PKG_CONFIG='/usr/bin/pkg-config'
+PKG_CONFIG_LIBDIR=''
+PKG_CONFIG_PATH=''
+RANLIB='ranlib'
+SET_MAKE=''
 SHELL='/bin/sh'
-ac_ct_CC=''
+STRIP=''
+VERSION='6.66'
+ac_ct_CC='gcc'
+am__EXEEXT_FALSE=''
+am__EXEEXT_TRUE='#'
+am__fastdepCC_FALSE='#'
+am__fastdepCC_TRUE=''
+am__include='include'
+am__isrc=''
+am__leading_dot='.'
+am__nodep='_no'
+am__quote=''
+am__tar='$${TAR-tar} chof - "$$tardir"'
+am__untar='$${TAR-tar} xf -'
 bindir='${exec_prefix}/bin'
 build_alias=''
 datadir='${datarootdir}'
 datarootdir='${prefix}/share'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
 dvidir='${docdir}'
-exec_prefix='NONE'
+exec_prefix='${prefix}'
 host_alias=''
 htmldir='${docdir}'
 includedir='${prefix}/include'
 infodir='${datarootdir}/info'
+install_sh='${SHELL} /home/franklin/puzzles/install-sh'
 libdir='${exec_prefix}/lib'
 libexecdir='${exec_prefix}/libexec'
 localedir='${datarootdir}/locale'
 localstatedir='${prefix}/var'
 mandir='${datarootdir}/man'
+mkdir_p='$(MKDIR_P)'
 oldincludedir='/usr/include'
 pdfdir='${docdir}'
-prefix='NONE'
+prefix='/usr/local'
 program_transform_name='s,x,x,'
 psdir='${docdir}'
 sbindir='${exec_prefix}/sbin'
@@ -131,5 +421,25 @@ target_alias=''
 #define PACKAGE_STRING "puzzles 6.66"
 #define PACKAGE_BUGREPORT "anakin@pobox.com"
 #define PACKAGE_URL ""
+#define PACKAGE "puzzles"
+#define VERSION "6.66"
+
+configure: exit 0
+
+## ---------------------- ##
+## Running config.status. ##
+## ---------------------- ##
+
+This file was extended by puzzles config.status 6.66, which was
+generated by GNU Autoconf 2.69.  Invocation command line was
+
+  CONFIG_FILES    = 
+  CONFIG_HEADERS  = 
+  CONFIG_LINKS    = 
+  CONFIG_COMMANDS = 
+  $ ./config.status 
+
+on alpha
 
-configure: exit 2
+config.status:782: creating Makefile
+config.status:954: executing depfiles commands
diff --git a/apps/plugins/puzzles/src/cube.c b/apps/plugins/puzzles/src/cube.c
index a30dc10b3f..2a79a81eef 100644
--- a/apps/plugins/puzzles/src/cube.c
+++ b/apps/plugins/puzzles/src/cube.c
@@ -238,7 +238,7 @@ static game_params *default_params(void)
 static int game_fetch_preset(int i, char **name, game_params **params)
 {
     game_params *ret = snew(game_params);
-    char *str;
+    const char *str;
 
     switch (i) {
       case 0:
@@ -489,25 +489,21 @@ static config_item *game_configure(const game_params *params)
 
     ret[0].name = "Type of solid";
     ret[0].type = C_CHOICES;
-    ret[0].sval = ":Tetrahedron:Cube:Octahedron:Icosahedron";
-    ret[0].ival = params->solid;
+    ret[0].u.choices.choicenames = ":Tetrahedron:Cube:Octahedron:Icosahedron";
+    ret[0].u.choices.selected = params->solid;
 
     ret[1].name = "Width / top";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->d1);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Height / bottom";
     ret[2].type = C_STRING;
     sprintf(buf, "%d", params->d2);
-    ret[2].sval = dupstr(buf);
-    ret[2].ival = 0;
+    ret[2].u.string.sval = dupstr(buf);
 
     ret[3].name = NULL;
     ret[3].type = C_END;
-    ret[3].sval = NULL;
-    ret[3].ival = 0;
 
     return ret;
 }
@@ -516,9 +512,9 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->solid = cfg[0].ival;
-    ret->d1 = atoi(cfg[1].sval);
-    ret->d2 = atoi(cfg[2].sval);
+    ret->solid = cfg[0].u.choices.selected;
+    ret->d1 = atoi(cfg[1].u.string.sval);
+    ret->d2 = atoi(cfg[2].u.string.sval);
 
     return ret;
 }
@@ -538,7 +534,7 @@ static void count_grid_square_callback(void *ctx, struct grid_square *sq)
     classes[thisclass]++;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     int classes[5];
     int i;
@@ -846,7 +842,7 @@ static struct solid *transform_poly(const struct solid *solid, int flip,
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int area = grid_area(params->d1, params->d2, solids[params->solid]->order);
     int i, j;
@@ -1004,7 +1000,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     return NULL;
 }
diff --git a/apps/plugins/puzzles/src/devel.but b/apps/plugins/puzzles/src/devel.but
index 25a6c62dfa..131678c17b 100644
--- a/apps/plugins/puzzles/src/devel.but
+++ b/apps/plugins/puzzles/src/devel.but
@@ -555,16 +555,15 @@ The \cw{config_item} structure contains the following elements:
 
 \c char *name;
 \c int type;
-\c char *sval;
-\c int ival;
+\c union { /* type-specific fields */ } u;
+\e         iiiiiiiiiiiiiiiiiiiiiiiiii
 
 \c{name} is an ASCII string giving the textual label for a GUI
 control. It is \e{not} expected to be dynamically allocated.
 
 \c{type} contains one of a small number of \c{enum} values defining
-what type of control is being described. The meaning of the \c{sval}
-and \c{ival} fields depends on the value in \c{type}. The valid
-values are:
+what type of control is being described. The usable member of the
+union field \c{u} depends on \c{type}. The valid type values are:
 
 \dt \c{C_STRING}
 
@@ -572,38 +571,64 @@ values are:
 input. The back end does not bother informing the front end that the
 box is numeric rather than textual; some front ends do have the
 capacity to take this into account, but I decided it wasn't worth
-the extra complexity in the interface.) For this type, \c{ival} is
-unused, and \c{sval} contains a dynamically allocated string
-representing the contents of the input box.
+the extra complexity in the interface.)
+
+\lcont{
+
+For controls of this type, \c{u.string} contains a single field
+
+\c char *sval;
+
+which stores a dynamically allocated string representing the contents
+of the input box.
+
+}
 
 \dt \c{C_BOOLEAN}
 
-\dd Describes a simple checkbox. For this type, \c{sval} is unused,
-and \c{ival} is \cw{TRUE} or \cw{FALSE}.
+\dd Describes a simple checkbox.
+
+\lcont{
+
+For controls of this type, \c{u.boolean} contains a single field
+
+\c int bval;
+
+which is either \cw{TRUE} or \cw{FALSE}.
+
+}
 
 \dt \c{C_CHOICES}
 
 \dd Describes a drop-down list presenting one of a small number of
-fixed choices. For this type, \c{sval} contains a list of strings
-describing the choices; the very first character of \c{sval} is used
-as a delimiter when processing the rest (so that the strings
-\cq{:zero:one:two}, \cq{!zero!one!two} and \cq{xzeroxonextwo} all
-define a three-element list containing \cq{zero}, \cq{one} and
-\cq{two}). \c{ival} contains the index of the currently selected
-element, numbering from zero (so that in the above example, 0 would
-mean \cq{zero} and 2 would mean \cq{two}).
+fixed choices.
 
 \lcont{
 
-Note that for this control type, \c{sval} is \e{not} dynamically
-allocated, whereas it was for \c{C_STRING}.
+For controls of this type, \c{u.choices} contains two fields:
+
+\c const char *choicenames;
+\c int selected;
+
+\c{choicenames} contains a list of strings describing the choices. The
+very first character of \c{sval} is used as a delimiter when
+processing the rest (so that the strings \cq{:zero:one:two},
+\cq{!zero!one!two} and \cq{xzeroxonextwo} all define a three-element
+list containing \cq{zero}, \cq{one} and \cq{two}).
+
+\c{selected} contains the index of the currently selected element,
+numbering from zero (so that in the above example, 0 would mean
+\cq{zero} and 2 would mean \cq{two}).
+
+Note that \c{u.choices.choicenames} is \e{not} dynamically allocated,
+unlike \c{u.string.sval}.
 
 }
 
 \dt \c{C_END}
 
-\dd Marks the end of the array of \c{config_item}s. All other fields
-are unused.
+\dd Marks the end of the array of \c{config_item}s. There is no
+associated member of the union field \c{u} for this type.
 
 The array returned from this function is expected to have filled in
 the initial values of all the controls according to the input
@@ -639,7 +664,8 @@ function is never called and need not do anything at all.
 
 \S{backend-validate-params} \cw{validate_params()}
 
-\c char *(*validate_params)(const game_params *params, int full);
+\c const char *(*validate_params)(const game_params *params,
+\c                                int full);
 
 This function takes a \c{game_params} structure as input, and checks
 that the parameters described in it fall within sensible limits. (At
@@ -724,7 +750,8 @@ again in the game description.
 
 \S{backend-validate-desc} \cw{validate_desc()}
 
-\c char *(*validate_desc)(const game_params *params, const char *desc);
+\c const char *(*validate_desc)(const game_params *params,
+\c                              const char *desc);
 
 This function is given a game description, and its job is to
 validate that it describes a puzzle which makes sense.
@@ -907,10 +934,10 @@ divide mouse coordinates by it.)
 in response to the input event; the puzzle was not interested in it
 at all.
 
-\b Returning the empty string (\cw{""}) indicates that the input
+\b Returning the special value \cw{UI_UPDATE} indicates that the input
 event has resulted in a change being made to the \c{game_ui} which
-will require a redraw of the game window, but that no actual
-\e{move} was made (i.e. no new \c{game_state} needs to be created).
+will require a redraw of the game window, but that no actual \e{move}
+was made (i.e. no new \c{game_state} needs to be created).
 
 \b Returning anything else indicates that a move was made and that a
 new \c{game_state} must be created. However, instead of actually
@@ -925,7 +952,7 @@ strings can be written to disk when saving the game and fed to
 
 The return value from \cw{interpret_move()} is expected to be
 dynamically allocated if and only if it is not either \cw{NULL}
-\e{or} the empty string.
+\e{or} the special string constant \c{UI_UPDATE}.
 
 After this function is called, the back end is permitted to rely on
 some subsequent operations happening in sequence:
@@ -1028,7 +1055,7 @@ not even offer the \q{Solve} menu option.
 \S{backend-solve} \cw{solve()}
 
 \c char *(*solve)(const game_state *orig, const game_state *curr,
-\c                const char *aux, char **error);
+\c                const char *aux, const char **error);
 
 This function is called when the user selects the \q{Solve} option
 from the menu.
@@ -1934,7 +1961,8 @@ This ensures that thin lines are visible even at small scales.
 \S{drawing-draw-text} \cw{draw_text()}
 
 \c void draw_text(drawing *dr, int x, int y, int fonttype,
-\c                int fontsize, int align, int colour, char *text);
+\c                int fontsize, int align, int colour,
+\c                const char *text);
 
 Draws text in the puzzle window.
 
@@ -2095,7 +2123,7 @@ printing routines, that code may safely call \cw{draw_update()}.)
 
 \S{drawing-status-bar} \cw{status_bar()}
 
-\c void status_bar(drawing *dr, char *text);
+\c void status_bar(drawing *dr, const char *text);
 
 Sets the text in the game's status bar to \c{text}. The text is copied
 from the supplied buffer, so the caller is free to deallocate or
@@ -2366,7 +2394,8 @@ function \cw{drawing_new()} (see \k{drawing-new}).
 \S{drawingapi-draw-text} \cw{draw_text()}
 
 \c void (*draw_text)(void *handle, int x, int y, int fonttype,
-\c                   int fontsize, int align, int colour, char *text);
+\c                   int fontsize, int align, int colour,
+\c                   const char *text);
 
 This function behaves exactly like the back end \cw{draw_text()}
 function; see \k{drawing-draw-text}.
@@ -2469,7 +2498,7 @@ called unless drawing is attempted.
 
 \S{drawingapi-status-bar} \cw{status_bar()}
 
-\c void (*status_bar)(void *handle, char *text);
+\c void (*status_bar)(void *handle, const char *text);
 
 This function behaves exactly like the back end \cw{status_bar()}
 function; see \k{drawing-status-bar}.
@@ -3129,8 +3158,8 @@ will probably need to pass it to \cw{midend_set_config}.)
 
 \H{midend-set-config} \cw{midend_set_config()}
 
-\c char *midend_set_config(midend *me, int which,
-\c                         config_item *cfg);
+\c const char *midend_set_config(midend *me, int which,
+\c                               config_item *cfg);
 
 Passes the mid-end the results of a configuration dialog box.
 \c{which} should have the same value which it had when
@@ -3151,7 +3180,7 @@ using \cw{midend_size()} and eventually perform a refresh using
 
 \H{midend-game-id} \cw{midend_game_id()}
 
-\c char *midend_game_id(midend *me, char *id);
+\c const char *midend_game_id(midend *me, const char *id);
 
 Passes the mid-end a string game ID (of any of the valid forms
 \cq{params}, \cq{params:description} or \cq{params#seed}) which the
@@ -3219,7 +3248,7 @@ conversion.
 
 \H{midend-solve} \cw{midend_solve()}
 
-\c char *midend_solve(midend *me);
+\c const char *midend_solve(midend *me);
 
 Requests the mid-end to perform a Solve operation.
 
@@ -3267,8 +3296,7 @@ visually activate and deactivate a redo button.
 \H{midend-serialise} \cw{midend_serialise()}
 
 \c void midend_serialise(midend *me,
-\c                       void (*write)(void *ctx, void *buf, int len),
-\c                       void *wctx);
+\c     void (*write)(void *ctx, const void *buf, int len), void *wctx);
 
 Calling this function causes the mid-end to convert its entire
 internal state into a long ASCII text string, and to pass that
@@ -3291,9 +3319,8 @@ output string.
 
 \H{midend-deserialise} \cw{midend_deserialise()}
 
-\c char *midend_deserialise(midend *me,
-\c                          int (*read)(void *ctx, void *buf, int len),
-\c                          void *rctx);
+\c const char *midend_deserialise(midend *me,
+\c     int (*read)(void *ctx, void *buf, int len), void *rctx);
 
 This function is the counterpart to \cw{midend_serialise()}. It
 calls the supplied \cw{read} function repeatedly to read a quantity
@@ -3330,9 +3357,8 @@ place.
 
 \H{identify-game} \cw{identify_game()}
 
-\c char *identify_game(char **name,
-\c                     int (*read)(void *ctx, void *buf, int len),
-\c                     void *rctx);
+\c const char *identify_game(char **name,
+\c     int (*read)(void *ctx, void *buf, int len), void *rctx);
 
 This function examines a serialised midend stream, of the same kind
 used by \cw{midend_serialise()} and \cw{midend_deserialise()}, and
@@ -3482,7 +3508,7 @@ calling \cw{midend_timer()}.
 
 \H{frontend-fatal} \cw{fatal()}
 
-\c void fatal(char *fmt, ...);
+\c void fatal(const char *fmt, ...);
 
 This is called by some utility functions if they encounter a
 genuinely fatal error such as running out of memory. It is a
@@ -3737,10 +3763,10 @@ quite everywhere.)
 
 \c void free_cfg(config_item *cfg);
 
-This function correctly frees an array of \c{config_item}s,
-including walking the array until it gets to the end and freeing
-precisely those \c{sval} fields which are expected to be dynamically
-allocated.
+This function correctly frees an array of \c{config_item}s, including
+walking the array until it gets to the end and freeing any subsidiary
+data items in each \c{u} sub-union which are expected to be
+dynamically allocated.
 
 (See \k{backend-configure} for details of the \c{config_item}
 structure.)
diff --git a/apps/plugins/puzzles/src/dominosa.c b/apps/plugins/puzzles/src/dominosa.c
index c86ba19dfa..a072ac6168 100644
--- a/apps/plugins/puzzles/src/dominosa.c
+++ b/apps/plugins/puzzles/src/dominosa.c
@@ -169,18 +169,14 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Maximum number on dominoes";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->n);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Ensure unique solution";
     ret[1].type = C_BOOLEAN;
-    ret[1].sval = NULL;
-    ret[1].ival = params->unique;
+    ret[1].u.boolean.bval = params->unique;
 
     ret[2].name = NULL;
     ret[2].type = C_END;
-    ret[2].sval = NULL;
-    ret[2].ival = 0;
 
     return ret;
 }
@@ -189,13 +185,13 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->n = atoi(cfg[0].sval);
-    ret->unique = cfg[1].ival;
+    ret->n = atoi(cfg[0].u.string.sval);
+    ret->unique = cfg[1].u.boolean.bval;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->n < 1)
         return "Maximum face number must be at least one";
@@ -748,12 +744,12 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int n = params->n, w = n+2, h = n+1, wh = w*h;
     int *occurrences;
     int i, j;
-    char *ret;
+    const char *ret;
 
     ret = NULL;
     occurrences = snewn(n+1, int);
@@ -875,7 +871,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     int n = state->params.n, w = n+2, h = n+1, wh = w*h;
     int *placements;
@@ -1119,7 +1115,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
 
         move_cursor(button, &ui->cur_x, &ui->cur_y, 2*w-1, 2*h-1, 0);
 
-        return "";
+        return UI_UPDATE;
     } else if (IS_CURSOR_SELECT(button)) {
         int d1, d2;
 
@@ -1152,7 +1148,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         } else {
             return NULL;
         }
-        return "";
+        return UI_UPDATE;
     }
 
     return NULL;
diff --git a/apps/plugins/puzzles/src/drawing.c b/apps/plugins/puzzles/src/drawing.c
index a10a7f06d6..caf0b4b43a 100644
--- a/apps/plugins/puzzles/src/drawing.c
+++ b/apps/plugins/puzzles/src/drawing.c
@@ -71,7 +71,7 @@ void drawing_free(drawing *dr)
 }
 
 void draw_text(drawing *dr, int x, int y, int fonttype, int fontsize,
-               int align, int colour, char *text)
+               int align, int colour, const char *text)
 {
     dr->api->draw_text(dr->handle, x, y, fonttype, fontsize, align,
                        colour, text);
@@ -190,7 +190,7 @@ char *text_fallback(drawing *dr, const char *const *strings, int nstrings)
     return NULL;                       /* placate optimiser */
 }
 
-void status_bar(drawing *dr, char *text)
+void status_bar(drawing *dr, const char *text)
 {
     char *rewritten;
 
diff --git a/apps/plugins/puzzles/src/emcc.c b/apps/plugins/puzzles/src/emcc.c
index 23ab333f5d..563fbe2799 100644
--- a/apps/plugins/puzzles/src/emcc.c
+++ b/apps/plugins/puzzles/src/emcc.c
@@ -122,7 +122,7 @@ void get_random_seed(void **randseed, int *randseedsize)
  * Fatal error, called in cases of complete despair such as when
  * malloc() has returned NULL.
  */
-void fatal(char *fmt, ...)
+void fatal(const char *fmt, ...)
 {
     char buf[512];
     va_list ap;
@@ -136,7 +136,7 @@ void fatal(char *fmt, ...)
     js_error_box(buf);
 }
 
-void debug_printf(char *fmt, ...)
+void debug_printf(const char *fmt, ...)
 {
     char buf[512];
     va_list ap;
@@ -384,7 +384,8 @@ static void js_unclip(void *handle)
 }
 
 static void js_draw_text(void *handle, int x, int y, int fonttype,
-                         int fontsize, int align, int colour, char *text)
+                         int fontsize, int align, int colour,
+                         const char *text)
 {
     char fontstyle[80];
     int halign;
@@ -515,7 +516,7 @@ static void js_end_draw(void *handle)
     js_canvas_end_draw();
 }
 
-static void js_status_bar(void *handle, char *text)
+static void js_status_bar(void *handle, const char *text)
 {
     js_canvas_set_statusbar(text);
 }
@@ -599,13 +600,14 @@ static void cfg_start(int which)
     for (i = 0; cfg[i].type != C_END; i++) {
         switch (cfg[i].type) {
           case C_STRING:
-            js_dialog_string(i, cfg[i].name, cfg[i].sval);
+            js_dialog_string(i, cfg[i].name, cfg[i].u.string.sval);
             break;
           case C_BOOLEAN:
-            js_dialog_boolean(i, cfg[i].name, cfg[i].ival);
+            js_dialog_boolean(i, cfg[i].name, cfg[i].u.boolean.bval);
             break;
           case C_CHOICES:
-            js_dialog_choices(i, cfg[i].name, cfg[i].sval, cfg[i].ival);
+            js_dialog_choices(i, cfg[i].name, cfg[i].u.choices.choicenames,
+                              cfg[i].u.choices.selected);
             break;
         }
     }
@@ -619,12 +621,29 @@ static void cfg_start(int which)
  */
 void dlg_return_sval(int index, const char *val)
 {
-    sfree(cfg[index].sval);
-    cfg[index].sval = dupstr(val);
+    config_item *i = cfg + index;
+    switch (i->type) {
+      case C_STRING:
+        sfree(i->u.string.sval);
+        i->u.string.sval = dupstr(val);
+        break;
+      default:
+        assert(0 && "Bad type for return_sval");
+    }
 }
 void dlg_return_ival(int index, int val)
 {
-    cfg[index].ival = val;
+    config_item *i = cfg + index;
+    switch (i->type) {
+      case C_BOOLEAN:
+        i->u.boolean.bval = val;
+        break;
+      case C_CHOICES:
+        i->u.choices.selected = val;
+        break;
+      default:
+        assert(0 && "Bad type for return_ival");
+    }
 }
 
 /*
@@ -638,7 +657,7 @@ static void cfg_end(int use_results)
         /*
          * User hit OK.
          */
-        char *err = midend_set_config(me, cfg_which, cfg);
+        const char *err = midend_set_config(me, cfg_which, cfg);
 
         if (err) {
             /*
@@ -748,7 +767,7 @@ void command(int n)
         break;
       case 9:                          /* Solve */
         if (thegame.can_solve) {
-            char *msg = midend_solve(me);
+            const char *msg = midend_solve(me);
             if (msg)
                 js_error_box(msg);
         }
@@ -768,7 +787,7 @@ struct savefile_write_ctx {
     size_t pos;
 };
 
-static void savefile_write(void *vctx, void *buf, int len)
+static void savefile_write(void *vctx, const void *buf, int len)
 {
     struct savefile_write_ctx *ctx = (struct savefile_write_ctx *)vctx;
     if (ctx->buffer)
@@ -845,7 +864,7 @@ void load_game(const char *buffer, int len)
  */
 int main(int argc, char **argv)
 {
-    char *param_err;
+    const char *param_err;
     float *colours;
     int i;
 
diff --git a/apps/plugins/puzzles/src/fifteen.c b/apps/plugins/puzzles/src/fifteen.c
index aee89071ca..f749e96b24 100644
--- a/apps/plugins/puzzles/src/fifteen.c
+++ b/apps/plugins/puzzles/src/fifteen.c
@@ -111,19 +111,15 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = NULL;
     ret[2].type = C_END;
-    ret[2].sval = NULL;
-    ret[2].ival = 0;
 
     return ret;
 }
@@ -132,13 +128,13 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 2 || params->h < 2)
         return "Width and height must both be at least two";
@@ -274,10 +270,10 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     const char *p;
-    char *err;
+    const char *err;
     int i, area;
     int *used;
 
@@ -383,7 +379,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     return dupstr("S");
 }
@@ -1130,7 +1126,8 @@ int main(int argc, char **argv)
 {
     game_params *params;
     game_state *state;
-    char *id = NULL, *desc, *err;
+    char *id = NULL, *desc;
+    const char *err;
     int grade = FALSE;
     char *progname = argv[0];
 
diff --git a/apps/plugins/puzzles/src/filling.c b/apps/plugins/puzzles/src/filling.c
index d8d0c8cbb0..7e71eb25b4 100644
--- a/apps/plugins/puzzles/src/filling.c
+++ b/apps/plugins/puzzles/src/filling.c
@@ -68,7 +68,7 @@
 
 static unsigned char verbose;
 
-static void printv(char *fmt, ...) {
+static void printv(const char *fmt, ...) {
 #ifndef PALM
     if (verbose) {
         va_list va;
@@ -161,19 +161,15 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = NULL;
     ret[2].type = C_END;
-    ret[2].sval = NULL;
-    ret[2].ival = 0;
 
     return ret;
 }
@@ -182,13 +178,13 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 1) return "Width must be at least one";
     if (params->h < 1) return "Height must be at least one";
@@ -1270,7 +1266,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return sresize(description, j, char);
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     const int sz = params->w * params->h;
     const char m = '0' + max(max(params->w, params->h), 3);
@@ -1342,7 +1338,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     if (aux == NULL) {
         const int w = state->shared->params.w;
@@ -1449,22 +1445,22 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                 ui->sel[w*ty+tx] = 1;
         }
         ui->cur_visible = 0;
-        return ""; /* redraw */
+        return UI_UPDATE;
     }
 
     if (IS_CURSOR_MOVE(button)) {
         ui->cur_visible = 1;
         move_cursor(button, &ui->cur_x, &ui->cur_y, w, h, 0);
         if (ui->keydragging) goto select_square;
-        return "";
+        return UI_UPDATE;
     }
     if (button == CURSOR_SELECT) {
         if (!ui->cur_visible) {
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
         ui->keydragging = !ui->keydragging;
-        if (!ui->keydragging) return "";
+        if (!ui->keydragging) return UI_UPDATE;
 
       select_square:
         if (!ui->sel) {
@@ -1473,12 +1469,12 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         }
         if (!state->shared->clues[w*ui->cur_y + ui->cur_x])
             ui->sel[w*ui->cur_y + ui->cur_x] = 1;
-        return "";
+        return UI_UPDATE;
     }
     if (button == CURSOR_SELECT2) {
         if (!ui->cur_visible) {
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
         if (!ui->sel) {
             ui->sel = snewn(w*h, int);
@@ -1492,14 +1488,14 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             sfree(ui->sel);
             ui->sel = NULL;
         }
-        return "";
+        return UI_UPDATE;
     }
 
     if (button == '\b' || button == 27) {
         sfree(ui->sel);
         ui->sel = NULL;
         ui->keydragging = FALSE;
-        return "";
+        return UI_UPDATE;
     }
 
     if (button < '0' || button > '9') return NULL;
@@ -1534,7 +1530,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
     sfree(ui->sel);
     ui->sel = NULL;
     /* Need to update UI at least, as we cleared the selection */
-    return move ? move : "";
+    return move ? move : UI_UPDATE;
 }
 
 static game_state *execute_move(const game_state *state, const char *move)
diff --git a/apps/plugins/puzzles/src/flip.c b/apps/plugins/puzzles/src/flip.c
index c7126fb7d9..9e5716a118 100644
--- a/apps/plugins/puzzles/src/flip.c
+++ b/apps/plugins/puzzles/src/flip.c
@@ -149,24 +149,20 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Shape type";
     ret[2].type = C_CHOICES;
-    ret[2].sval = ":Crosses:Random";
-    ret[2].ival = params->matrix_type;
+    ret[2].u.choices.choicenames = ":Crosses:Random";
+    ret[2].u.choices.selected = params->matrix_type;
 
     ret[3].name = NULL;
     ret[3].type = C_END;
-    ret[3].sval = NULL;
-    ret[3].ival = 0;
 
     return ret;
 }
@@ -175,14 +171,14 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->matrix_type = cfg[2].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->matrix_type = cfg[2].u.choices.selected;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w <= 0 || params->h <= 0)
         return "Width and height must both be greater than zero";
@@ -596,7 +592,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int w = params->w, h = params->h, wh = w * h;
     int mlen = (wh*wh+3)/4, glen = (wh+3)/4;
@@ -673,7 +669,7 @@ static void rowxor(unsigned char *row1, unsigned char *row2, int len)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     int w = state->w, h = state->h, wh = w * h;
     unsigned char *equations, *solution, *shortest;
@@ -951,7 +947,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             tx = ui->cx; ty = ui->cy;
             ui->cdraw = 1;
         }
-        nullret = "";
+        nullret = UI_UPDATE;
 
         if (tx >= 0 && tx < w && ty >= 0 && ty < h) {
             /*
@@ -985,7 +981,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         ui->cx = min(max(ui->cx, 0), state->w - 1);
         ui->cy = min(max(ui->cy, 0), state->h - 1);
         ui->cdraw = 1;
-        nullret = "";
+        nullret = UI_UPDATE;
     }
 
     return nullret;
diff --git a/apps/plugins/puzzles/src/flood.c b/apps/plugins/puzzles/src/flood.c
index 59e160cfc3..854469a49a 100644
--- a/apps/plugins/puzzles/src/flood.c
+++ b/apps/plugins/puzzles/src/flood.c
@@ -170,31 +170,25 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Colours";
     ret[2].type = C_STRING;
     sprintf(buf, "%d", params->colours);
-    ret[2].sval = dupstr(buf);
-    ret[2].ival = 0;
+    ret[2].u.string.sval = dupstr(buf);
 
     ret[3].name = "Extra moves permitted";
     ret[3].type = C_STRING;
     sprintf(buf, "%d", params->leniency);
-    ret[3].sval = dupstr(buf);
-    ret[3].ival = 0;
+    ret[3].u.string.sval = dupstr(buf);
 
     ret[4].name = NULL;
     ret[4].type = C_END;
-    ret[4].sval = NULL;
-    ret[4].ival = 0;
 
     return ret;
 }
@@ -203,15 +197,15 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->colours = atoi(cfg[2].sval);
-    ret->leniency = atoi(cfg[3].sval);
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->colours = atoi(cfg[2].u.string.sval);
+    ret->leniency = atoi(cfg[3].u.string.sval);
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w * params->h < 2)
         return "Grid must contain at least two squares";
@@ -597,7 +591,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return desc;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int w = params->w, h = params->h, wh = w*h;
     int i;
@@ -691,7 +685,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     int w = state->w, h = state->h, wh = w*h;
     char *moves, *ret, *p;
@@ -832,19 +826,19 @@ static char *interpret_move(const game_state *state, game_ui *ui,
     } else if (button == CURSOR_LEFT && ui->cx > 0) {
         ui->cx--;
         ui->cursor_visible = TRUE;
-        return "";
+        return UI_UPDATE;
     } else if (button == CURSOR_RIGHT && ui->cx+1 < w) {
         ui->cx++;
         ui->cursor_visible = TRUE;
-        return "";
+        return UI_UPDATE;
     } else if (button == CURSOR_UP && ui->cy > 0) {
         ui->cy--;
         ui->cursor_visible = TRUE;
-        return "";
+        return UI_UPDATE;
     } else if (button == CURSOR_DOWN && ui->cy+1 < h) {
         ui->cy++;
         ui->cursor_visible = TRUE;
-        return "";
+        return UI_UPDATE;
     } else if (button == CURSOR_SELECT) {
         tx = ui->cx;
         ty = ui->cy;
diff --git a/apps/plugins/puzzles/src/galaxies.c b/apps/plugins/puzzles/src/galaxies.c
index f4f75c629c..5d7dbdf933 100644
--- a/apps/plugins/puzzles/src/galaxies.c
+++ b/apps/plugins/puzzles/src/galaxies.c
@@ -248,24 +248,20 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Difficulty";
     ret[2].type = C_CHOICES;
-    ret[2].sval = DIFFCONFIG;
-    ret[2].ival = params->diff;
+    ret[2].u.choices.choicenames = DIFFCONFIG;
+    ret[2].u.choices.selected = params->diff;
 
     ret[3].name = NULL;
     ret[3].type = C_END;
-    ret[3].sval = NULL;
-    ret[3].ival = 0;
 
     return ret;
 }
@@ -274,14 +270,14 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->diff = cfg[2].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->diff = cfg[2].u.choices.selected;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 3 || params->h < 3)
         return "Width and height must both be at least 3";
@@ -671,7 +667,8 @@ static char *diff_game(const game_state *src, const game_state *dest,
                        int issolve)
 {
     int movelen = 0, movesize = 256, x, y, len;
-    char *move = snewn(movesize, char), buf[80], *sep = "";
+    char *move = snewn(movesize, char), buf[80];
+    const char *sep = "";
     char achar = issolve ? 'a' : 'A';
     space *sps, *spd;
 
@@ -1527,10 +1524,10 @@ static int dots_too_close(game_state *state)
 }
 
 static game_state *load_game(const game_params *params, const char *desc,
-                             char **why_r)
+                             const char **why_r)
 {
     game_state *state = blank_game(params->w, params->h);
-    char *why = NULL;
+    const char *why = NULL;
     int i, x, y, n;
     unsigned int df;
 
@@ -1574,9 +1571,9 @@ fail:
     return NULL;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
-    char *why = NULL;
+    const char *why = NULL;
     game_state *dummy = load_game(params, desc, &why);
     if (dummy) {
         free_game(dummy);
@@ -2258,7 +2255,7 @@ got_result:
 
 #ifndef EDITOR
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     game_state *tosolve;
     char *ret;
@@ -2553,13 +2550,13 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             ui->dy = y;
             ui->dotx = dot->x;
             ui->doty = dot->y;
-            return "";
+            return UI_UPDATE;
         }
     } else if (button == RIGHT_DRAG && ui->dragging) {
         /* just move the drag coords. */
         ui->dx = x;
         ui->dy = y;
-        return "";
+        return UI_UPDATE;
     } else if (button == RIGHT_RELEASE && ui->dragging) {
         ui->dragging = FALSE;
 
@@ -2574,7 +2571,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
          * is a null move; just update the ui and finish.
          */
         if (px == ui->srcx && py == ui->srcy)
-            return "";
+            return UI_UPDATE;
 
         /*
          * Otherwise, we remove the arrow from its starting
@@ -2601,7 +2598,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         if (buf[0])
             return dupstr(buf);
         else
-            return "";
+            return UI_UPDATE;
     } else if (IS_CURSOR_MOVE(button)) {
         move_cursor(button, &ui->cur_x, &ui->cur_y, state->sx-1, state->sy-1, 0);
         if (ui->cur_x < 1) ui->cur_x = 1;
@@ -2611,11 +2608,11 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             ui->dx = SCOORD(ui->cur_x);
             ui->dy = SCOORD(ui->cur_y);
         }
-        return "";
+        return UI_UPDATE;
     } else if (IS_CURSOR_SELECT(button)) {
         if (!ui->cur_visible) {
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
         sp = &SPACE(state, ui->cur_x, ui->cur_y);
         if (ui->dragging) {
@@ -2637,7 +2634,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             ui->dy = SCOORD(ui->cur_y);
             ui->dotx = ui->srcx = ui->cur_x;
             ui->doty = ui->srcy = ui->cur_y;
-            return "";
+            return UI_UPDATE;
         } else if (sp->flags & F_TILE_ASSOC) {
             assert(sp->type == s_tile);
             ui->dragging = TRUE;
@@ -2647,7 +2644,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             ui->doty = sp->doty;
             ui->srcx = ui->cur_x;
             ui->srcy = ui->cur_y;
-            return "";
+            return UI_UPDATE;
         } else if (sp->type == s_edge) {
             sprintf(buf, "E%d,%d", ui->cur_x, ui->cur_y);
             return dupstr(buf);
@@ -3775,7 +3772,8 @@ static void soak(game_params *p, random_state *rs)
 int main(int argc, char **argv)
 {
     game_params *p;
-    char *id = NULL, *desc, *err;
+    char *id = NULL, *desc;
+    const char *err;
     game_state *s;
     int diff, do_soak = 0, verbose = 0;
     random_state *rs;
diff --git a/apps/plugins/puzzles/src/grid.c b/apps/plugins/puzzles/src/grid.c
index 4929b5c7d3..52648e5a92 100644
--- a/apps/plugins/puzzles/src/grid.c
+++ b/apps/plugins/puzzles/src/grid.c
@@ -1529,8 +1529,8 @@ static void grid_size_triangular(int width, int height,
     *yextent = height * vec_y;
 }
 
-static char *grid_validate_desc_triangular(grid_type type, int width,
-                                           int height, const char *desc)
+static const char *grid_validate_desc_triangular(grid_type type, int width,
+                                                 int height, const char *desc)
 {
     /*
      * Triangular grids: an absent description is valid (indicating
@@ -2855,8 +2855,9 @@ static char *grid_new_desc_penrose(grid_type type, int width, int height, random
     return dupstr(gd);
 }
 
-static char *grid_validate_desc_penrose(grid_type type, int width, int height,
-                                        const char *desc)
+static const char *grid_validate_desc_penrose(grid_type type,
+                                              int width, int height,
+                                              const char *desc)
 {
     int tilesize = PENROSE_TILESIZE, startsz, depth, xoff, yoff, aoff, inner_radius;
     double outer_radius;
@@ -3032,8 +3033,8 @@ char *grid_new_desc(grid_type type, int width, int height, random_state *rs)
     }
 }
 
-char *grid_validate_desc(grid_type type, int width, int height,
-                         const char *desc)
+const char *grid_validate_desc(grid_type type, int width, int height,
+                               const char *desc)
 {
     if (type == GRID_PENROSE_P2 || type == GRID_PENROSE_P3) {
         return grid_validate_desc_penrose(type, width, height, desc);
@@ -3048,7 +3049,7 @@ char *grid_validate_desc(grid_type type, int width, int height,
 
 grid *grid_new(grid_type type, int width, int height, const char *desc)
 {
-    char *err = grid_validate_desc(type, width, height, desc);
+    const char *err = grid_validate_desc(type, width, height, desc);
     if (err) assert(!"Invalid grid description.");
 
     return grid_news[type](width, height, desc);
diff --git a/apps/plugins/puzzles/src/grid.h b/apps/plugins/puzzles/src/grid.h
index fb8ac48790..19079a44b8 100644
--- a/apps/plugins/puzzles/src/grid.h
+++ b/apps/plugins/puzzles/src/grid.h
@@ -116,8 +116,8 @@ typedef enum grid_type { GRIDGEN_LIST(ENUM) GRID_TYPE_MAX } grid_type;
 /* Free directly after use if non-NULL. Will never contain an underscore
  * (so clients can safely use that as a separator). */
 char *grid_new_desc(grid_type type, int width, int height, random_state *rs);
-char *grid_validate_desc(grid_type type, int width, int height,
-                         const char *desc);
+const char *grid_validate_desc(grid_type type, int width, int height,
+                               const char *desc);
 
 grid *grid_new(grid_type type, int width, int height, const char *desc);
 
diff --git a/apps/plugins/puzzles/src/gtk.c b/apps/plugins/puzzles/src/gtk.c
index c212522957..37ba8078e2 100644
--- a/apps/plugins/puzzles/src/gtk.c
+++ b/apps/plugins/puzzles/src/gtk.c
@@ -71,7 +71,7 @@
 #ifdef DEBUGGING
 static FILE *debug_fp = NULL;
 
-void dputs(char *buf)
+void dputs(const char *buf)
 {
     if (!debug_fp) {
         debug_fp = fopen("debug.log", "w");
@@ -85,7 +85,7 @@ void dputs(char *buf)
     }
 }
 
-void debug_printf(char *fmt, ...)
+void debug_printf(const char *fmt, ...)
 {
     char buf[4096];
     va_list ap;
@@ -101,7 +101,7 @@ void debug_printf(char *fmt, ...)
  * Error reporting functions used elsewhere.
  */
 
-void fatal(char *fmt, ...)
+void fatal(const char *fmt, ...)
 {
     va_list ap;
 
@@ -189,6 +189,38 @@ struct frontend {
     int drawing_area_shrink_pending;
     int menubar_is_local;
 #endif
+#if GTK_CHECK_VERSION(3,0,0)
+    /*
+     * This is used to get round an annoying lack of GTK notification
+     * message. If we request a window resize with
+     * gtk_window_resize(), we normally get back a "configure" event
+     * on the window and on its drawing area, and we respond to the
+     * latter by doing an appropriate resize of the puzzle. If the
+     * window is maximised, so that gtk_window_resize() _doesn't_
+     * change its size, then that configure event never shows up. But
+     * if we requested the resize in response to a change of puzzle
+     * parameters (say, the user selected a differently-sized preset
+     * from the menu), then we would still like to be _notified_ that
+     * the window size was staying the same, so that we can respond by
+     * choosing an appropriate tile size for the new puzzle preset in
+     * the existing window size.
+     *
+     * Fortunately, in GTK 3, we may not get a "configure" event on
+     * the drawing area in this situation, but we still get a
+     * "size_allocate" event on the whole window (which, in other
+     * situations when we _do_ get a "configure" on the area, turns up
+     * second). So we treat _that_ event as indicating that if the
+     * "configure" event hasn't already shown up then it's not going
+     * to arrive.
+     *
+     * This flag is where we bookkeep this system. On
+     * gtk_window_resize we set this flag to true; the area's
+     * configure handler sets it back to false; then if that doesn't
+     * happen, the window's size_allocate handler does a fallback
+     * puzzle resize when it sees this flag still set to true.
+     */
+    int awaiting_resize_ack;
+#endif
 };
 
 struct blitter {
@@ -232,7 +264,7 @@ void frontend_default_colour(frontend *fe, float *output)
 #endif
 }
 
-void gtk_status_bar(void *handle, char *text)
+void gtk_status_bar(void *handle, const char *text)
 {
     frontend *fe = (frontend *)handle;
 
@@ -968,7 +1000,7 @@ void gtk_unclip(void *handle)
 }
 
 void gtk_draw_text(void *handle, int x, int y, int fonttype, int fontsize,
-                   int align, int colour, char *text)
+                   int align, int colour, const char *text)
 {
     frontend *fe = (frontend *)handle;
     int i;
@@ -1338,15 +1370,10 @@ static gint map_window(GtkWidget *widget, GdkEvent *event,
     return TRUE;
 }
 
-static gint configure_area(GtkWidget *widget,
-                           GdkEventConfigure *event, gpointer data)
+static void resize_puzzle_to_area(frontend *fe, int x, int y)
 {
-    frontend *fe = (frontend *)data;
-    int x, y;
     int oldw = fe->w, oldpw = fe->pw, oldh = fe->h, oldph = fe->ph;
 
-    x = event->width;
-    y = event->height;
     fe->w = x;
     fe->h = y;
     midend_size(fe->me, &x, &y, TRUE);
@@ -1363,10 +1390,31 @@ static gint configure_area(GtkWidget *widget,
     }
 
     midend_force_redraw(fe->me);
+}
 
+static gint configure_area(GtkWidget *widget,
+                           GdkEventConfigure *event, gpointer data)
+{
+    frontend *fe = (frontend *)data;
+    resize_puzzle_to_area(fe, event->width, event->height);
+    fe->awaiting_resize_ack = FALSE;
     return TRUE;
 }
 
+#if GTK_CHECK_VERSION(3,0,0)
+static void window_size_alloc(GtkWidget *widget, GtkAllocation *allocation,
+                              gpointer data)
+{
+    frontend *fe = (frontend *)data;
+    if (fe->awaiting_resize_ack) {
+        GtkAllocation a;
+        gtk_widget_get_allocation(fe->area, &a);
+        resize_puzzle_to_area(fe, a.width, a.height);
+        fe->awaiting_resize_ack = FALSE;
+    }
+}
+#endif
+
 static gint timer_func(gpointer data)
 {
     frontend *fe = (frontend *)data;
@@ -1444,8 +1492,8 @@ static void align_label(GtkLabel *label, double x, double y)
 }
 
 #if GTK_CHECK_VERSION(3,0,0)
-int message_box(GtkWidget *parent, char *title, char *msg, int centre,
-                int type)
+int message_box(GtkWidget *parent, const char *title, const char *msg,
+                int centre, int type)
 {
     GtkWidget *window;
     gint ret;
@@ -1539,7 +1587,7 @@ int message_box(GtkWidget *parent, char *title, char *msg, int centre,
 }
 #endif /* GTK_CHECK_VERSION(3,0,0) */
 
-void error_box(GtkWidget *parent, char *msg)
+void error_box(GtkWidget *parent, const char *msg)
 {
     message_box(parent, "Error", msg, FALSE, MB_OK);
 }
@@ -1547,7 +1595,7 @@ void error_box(GtkWidget *parent, char *msg)
 static void config_ok_button_clicked(GtkButton *button, gpointer data)
 {
     frontend *fe = (frontend *)data;
-    char *err;
+    const char *err;
 
     err = midend_set_config(fe->me, fe->cfg_which, fe->cfg);
 
@@ -1593,22 +1641,25 @@ static void editbox_changed(GtkEditable *ed, gpointer data)
 {
     config_item *i = (config_item *)data;
 
-    sfree(i->sval);
-    i->sval = dupstr(gtk_entry_get_text(GTK_ENTRY(ed)));
+    assert(i->type == C_STRING);
+    sfree(i->u.string.sval);
+    i->u.string.sval = dupstr(gtk_entry_get_text(GTK_ENTRY(ed)));
 }
 
 static void button_toggled(GtkToggleButton *tb, gpointer data)
 {
     config_item *i = (config_item *)data;
 
-    i->ival = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(tb));
+    assert(i->type == C_BOOLEAN);
+    i->u.boolean.bval = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(tb));
 }
 
 static void droplist_sel(GtkComboBox *combo, gpointer data)
 {
     config_item *i = (config_item *)data;
 
-    i->ival = gtk_combo_box_get_active(combo);
+    assert(i->type == C_CHOICES);
+    i->u.choices.selected = gtk_combo_box_get_active(combo);
 }
 
 static int get_config(frontend *fe, int which)
@@ -1703,7 +1754,7 @@ static int get_config(frontend *fe, int which)
                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
                              3, 3);
 #endif
-            gtk_entry_set_text(GTK_ENTRY(w), i->sval);
+            gtk_entry_set_text(GTK_ENTRY(w), i->u.string.sval);
             g_signal_connect(G_OBJECT(w), "changed",
                              G_CALLBACK(editbox_changed), i);
             g_signal_connect(G_OBJECT(w), "key_press_event",
@@ -1728,7 +1779,8 @@ static int get_config(frontend *fe, int which)
                              GTK_EXPAND | GTK_SHRINK | GTK_FILL,
                              3, 3);
 #endif
-            gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(w), i->ival);
+            gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(w),
+                                         i->u.boolean.bval);
             gtk_widget_show(w);
             break;
 
@@ -1751,15 +1803,16 @@ static int get_config(frontend *fe, int which)
 
             {
                 int c;
-                char *p, *q, *name;
+                const char *p, *q;
+                char *name;
                 GtkListStore *model;
                 GtkCellRenderer *cr;
                 GtkTreeIter iter;
 
                 model = gtk_list_store_new(1, G_TYPE_STRING);
 
-                c = *i->sval;
-                p = i->sval+1;
+                c = *i->u.choices.choicenames;
+                p = i->u.choices.choicenames+1;
 
                 while (*p) {
                     q = p;
@@ -1780,7 +1833,8 @@ static int get_config(frontend *fe, int which)
 
                 w = gtk_combo_box_new_with_model(GTK_TREE_MODEL(model));
 
-                gtk_combo_box_set_active(GTK_COMBO_BOX(w), i->ival);
+                gtk_combo_box_set_active(GTK_COMBO_BOX(w),
+                                         i->u.choices.selected);
 
                 cr = gtk_cell_renderer_text_new();
                 gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(w), cr, TRUE);
@@ -1881,8 +1935,7 @@ static void changed_preset(frontend *fe)
             struct preset_menu_entry *entry =
                 (struct preset_menu_entry *)g_object_get_data(
                     G_OBJECT(gs->data), "user-data");
-
-            if (entry && entry->id != n)
+            if (!entry || entry->id != n)
                 gtk_check_menu_item_set_active(
                     GTK_CHECK_MENU_ITEM(gs->data), FALSE);
             else
@@ -1890,7 +1943,7 @@ static void changed_preset(frontend *fe)
         }
         if (found)
             gtk_check_menu_item_set_active(
-                GTK_CHECK_MENU_ITEM(found->data), FALSE);
+                GTK_CHECK_MENU_ITEM(found->data), TRUE);
     }
     fe->preset_threaded = FALSE;
 
@@ -1996,6 +2049,7 @@ static void resize_fe(frontend *fe)
 
 #if GTK_CHECK_VERSION(3,0,0)
     gtk_window_resize(GTK_WINDOW(fe->window), x, y + window_extra_height(fe));
+    fe->awaiting_resize_ack = TRUE;
 #else
     fe->drawing_area_shrink_pending = FALSE;
     gtk_drawing_area_size(GTK_DRAWING_AREA(fe->area), x, y);
@@ -2114,7 +2168,7 @@ static void filesel_ok(GtkButton *button, gpointer data)
     fe->filesel_name = dupstr(name);
 }
 
-static char *file_selector(frontend *fe, char *title, int save)
+static char *file_selector(frontend *fe, const char *title, int save)
 {
     GtkWidget *filesel =
         gtk_file_selection_new(title);
@@ -2145,7 +2199,7 @@ static char *file_selector(frontend *fe, char *title, int save)
 
 #else
 
-static char *file_selector(frontend *fe, char *title, int save)
+static char *file_selector(frontend *fe, const char *title, int save)
 {
     char *filesel_name = NULL;
 
@@ -2177,7 +2231,7 @@ struct savefile_write_ctx {
     int error;
 };
 
-static void savefile_write(void *wctx, void *buf, int len)
+static void savefile_write(void *wctx, const void *buf, int len)
 {
     struct savefile_write_ctx *ctx = (struct savefile_write_ctx *)wctx;
     if (fwrite(buf, 1, len, ctx->fp) < len)
@@ -2244,7 +2298,8 @@ static void menu_save_event(GtkMenuItem *menuitem, gpointer data)
 static void menu_load_event(GtkMenuItem *menuitem, gpointer data)
 {
     frontend *fe = (frontend *)data;
-    char *name, *err;
+    char *name;
+    const char *err;
 
     name = file_selector(fe, "Enter name of saved game file to load", FALSE);
 
@@ -2275,7 +2330,7 @@ static void menu_load_event(GtkMenuItem *menuitem, gpointer data)
 static void menu_solve_event(GtkMenuItem *menuitem, gpointer data)
 {
     frontend *fe = (frontend *)data;
-    char *msg;
+    const char *msg;
 
     msg = midend_solve(fe->me);
 
@@ -2341,7 +2396,7 @@ static void menu_about_event(GtkMenuItem *menuitem, gpointer data)
 }
 
 static GtkWidget *add_menu_ui_item(
-    frontend *fe, GtkContainer *cont, char *text, int action,
+    frontend *fe, GtkContainer *cont, const char *text, int action,
     int accel_key, int accel_keyqual)
 {
     GtkWidget *menuitem = gtk_menu_item_new_with_label(text);
@@ -2434,7 +2489,7 @@ static frontend *new_window(char *arg, int argtype, char **error)
     fe->me = midend_new(fe, &thegame, &gtk_drawing, fe);
 
     if (arg) {
-        char *err;
+        const char *err;
         FILE *fp;
 
         errbuf[0] = '\0';
@@ -2522,6 +2577,10 @@ static frontend *new_window(char *arg, int argtype, char **error)
     }
 #endif
 
+#if GTK_CHECK_VERSION(3,0,0)
+    fe->awaiting_resize_ack = FALSE;
+#endif
+
     fe->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
     gtk_window_set_title(GTK_WINDOW(fe->window), thegame.name);
 
@@ -2786,6 +2845,10 @@ static frontend *new_window(char *arg, int argtype, char **error)
                      G_CALLBACK(configure_area), fe);
     g_signal_connect(G_OBJECT(fe->window), "configure_event",
                      G_CALLBACK(configure_window), fe);
+#if GTK_CHECK_VERSION(3,0,0)
+    g_signal_connect(G_OBJECT(fe->window), "size_allocate",
+                     G_CALLBACK(window_size_alloc), fe);
+#endif
 
     gtk_widget_add_events(GTK_WIDGET(fe->area),
                           GDK_BUTTON_PRESS_MASK |
@@ -2865,7 +2928,7 @@ int main(int argc, char **argv)
     int soln = FALSE, colour = FALSE;
     float scale = 1.0F;
     float redo_proportion = 0.0F;
-    char *savefile = NULL, *savesuffix = NULL;
+    const char *savefile = NULL, *savesuffix = NULL;
     char *arg = NULL;
     int argtype = ARG_EITHER;
     char *screenshot_file = NULL;
@@ -3108,7 +3171,8 @@ int main(int argc, char **argv)
          * generated descriptive game IDs.)
          */
         while (ngenerate == 0 || i < n) {
-            char *pstr, *err, *seed;
+            char *pstr, *seed;
+            const char *err;
             struct rusage before, after;
 
             if (ngenerate == 0) {
@@ -3162,7 +3226,7 @@ int main(int argc, char **argv)
                  * re-entering the same game id, and then try to solve
                  * it.
                  */
-                char *game_id, *err;
+                char *game_id;
 
                 game_id = midend_get_game_id(me);
                 err = midend_game_id(me, game_id);
@@ -3207,7 +3271,7 @@ int main(int argc, char **argv)
                 sprintf(realname, "%s%d%s", savefile, i, savesuffix);
 
                 if (soln) {
-                    char *err = midend_solve(me);
+                    const char *err = midend_solve(me);
                     if (err) {
                         fprintf(stderr, "%s: unable to show solution: %s\n",
                                 realname, err);
diff --git a/apps/plugins/puzzles/src/guess.c b/apps/plugins/puzzles/src/guess.c
index 8f058638da..a14f3bdc4d 100644
--- a/apps/plugins/puzzles/src/guess.c
+++ b/apps/plugins/puzzles/src/guess.c
@@ -74,7 +74,7 @@ static game_params *dup_params(const game_params *params)
 }
 
 static const struct {
-    char *name;
+    const char *name;
     game_params params;
 } guess_presets[] = {
     {"Standard", {6, 4, 10, FALSE, TRUE}},
@@ -166,35 +166,28 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Colours";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->ncolours);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Pegs per guess";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->npegs);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Guesses";
     ret[2].type = C_STRING;
     sprintf(buf, "%d", params->nguesses);
-    ret[2].sval = dupstr(buf);
-    ret[2].ival = 0;
+    ret[2].u.string.sval = dupstr(buf);
 
     ret[3].name = "Allow blanks";
     ret[3].type = C_BOOLEAN;
-    ret[3].sval = NULL;
-    ret[3].ival = params->allow_blank;
+    ret[3].u.boolean.bval = params->allow_blank;
 
     ret[4].name = "Allow duplicates";
     ret[4].type = C_BOOLEAN;
-    ret[4].sval = NULL;
-    ret[4].ival = params->allow_multiple;
+    ret[4].u.boolean.bval = params->allow_multiple;
 
     ret[5].name = NULL;
     ret[5].type = C_END;
-    ret[5].sval = NULL;
-    ret[5].ival = 0;
 
     return ret;
 }
@@ -203,17 +196,17 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->ncolours = atoi(cfg[0].sval);
-    ret->npegs = atoi(cfg[1].sval);
-    ret->nguesses = atoi(cfg[2].sval);
+    ret->ncolours = atoi(cfg[0].u.string.sval);
+    ret->npegs = atoi(cfg[1].u.string.sval);
+    ret->nguesses = atoi(cfg[2].u.string.sval);
 
-    ret->allow_blank = cfg[3].ival;
-    ret->allow_multiple = cfg[4].ival;
+    ret->allow_blank = cfg[3].u.boolean.bval;
+    ret->allow_multiple = cfg[4].u.boolean.bval;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->ncolours < 2 || params->npegs < 2)
         return "Trivial solutions are uninteresting";
@@ -287,7 +280,7 @@ newcol:
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     unsigned char *bmp;
     int i;
@@ -367,7 +360,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     return dupstr("S");
 }
@@ -447,7 +440,8 @@ static void free_ui(game_ui *ui)
 
 static char *encode_ui(const game_ui *ui)
 {
-    char *ret, *p, *sep;
+    char *ret, *p;
+    const char *sep;
     int i;
 
     /*
@@ -621,7 +615,8 @@ static int mark_pegs(pegrow guess, const pegrow solution, int ncols)
 
 static char *encode_move(const game_state *from, game_ui *ui)
 {
-    char *buf, *p, *sep;
+    char *buf, *p;
+    const char *sep;
     int len, i;
 
     len = ui->curr_pegs->npegs * 20 + 2;
@@ -779,7 +774,7 @@ static char *interpret_move(const game_state *from, game_ui *ui,
      */
     if (button == 'l' || button == 'L') {
         ui->show_labels = !ui->show_labels;
-        return "";
+        return UI_UPDATE;
     }
 
     if (from->solved) return NULL;
@@ -836,13 +831,13 @@ static char *interpret_move(const game_state *from, game_ui *ui,
             ui->drag_y = y;
             debug(("Start dragging, col = %d, (%d,%d)",
                    ui->drag_col, ui->drag_x, ui->drag_y));
-            ret = "";
+            ret = UI_UPDATE;
         }
     } else if (button == LEFT_DRAG && ui->drag_col) {
         ui->drag_x = x;
         ui->drag_y = y;
         debug(("Keep dragging, (%d,%d)", ui->drag_x, ui->drag_y));
-        ret = "";
+        ret = UI_UPDATE;
     } else if (button == LEFT_RELEASE && ui->drag_col) {
         if (over_guess > -1) {
             debug(("Dropping colour %d onto guess peg %d",
@@ -859,13 +854,13 @@ static char *interpret_move(const game_state *from, game_ui *ui,
         ui->drag_opeg = -1;
         ui->display_cur = 0;
         debug(("Stop dragging."));
-        ret = "";
+        ret = UI_UPDATE;
     } else if (button == RIGHT_BUTTON) {
         if (over_guess > -1) {
             /* we use ths feedback in the game_ui to signify
              * 'carry this peg to the next guess as well'. */
             ui->holds[over_guess] = 1 - ui->holds[over_guess];
-            ret = "";
+            ret = UI_UPDATE;
         }
     } else if (button == LEFT_RELEASE && over_hint && ui->markable) {
         /* NB this won't trigger if on the end of a drag; that's on
@@ -880,10 +875,10 @@ static char *interpret_move(const game_state *from, game_ui *ui,
             ui->colour_cur++;
         if (button == CURSOR_UP && ui->colour_cur > 0)
             ui->colour_cur--;
-        ret = "";
+        ret = UI_UPDATE;
     } else if (button == 'h' || button == 'H' || button == '?') {
         compute_hint(from, ui);
-        ret = "";
+        ret = UI_UPDATE;
     } else if (button == CURSOR_LEFT || button == CURSOR_RIGHT) {
         int maxcur = from->params.npegs;
         if (ui->markable) maxcur++;
@@ -893,25 +888,25 @@ static char *interpret_move(const game_state *from, game_ui *ui,
             ui->peg_cur++;
         if (button == CURSOR_LEFT && ui->peg_cur > 0)
             ui->peg_cur--;
-        ret = "";
+        ret = UI_UPDATE;
     } else if (IS_CURSOR_SELECT(button)) {
         ui->display_cur = 1;
         if (ui->peg_cur == from->params.npegs) {
             ret = encode_move(from, ui);
         } else {
             set_peg(&from->params, ui, ui->peg_cur, ui->colour_cur+1);
-            ret = "";
+            ret = UI_UPDATE;
         }
     } else if (button == 'D' || button == 'd' || button == '\b') {
         ui->display_cur = 1;
         set_peg(&from->params, ui, ui->peg_cur, 0);
-        ret = "";
+        ret = UI_UPDATE;
     } else if (button == CURSOR_SELECT2) {
         if (ui->peg_cur == from->params.npegs)
             return NULL;
         ui->display_cur = 1;
         ui->holds[ui->peg_cur] = 1 - ui->holds[ui->peg_cur];
-        ret = "";
+        ret = UI_UPDATE;
     }
     return ret;
 }
diff --git a/apps/plugins/puzzles/src/inertia.c b/apps/plugins/puzzles/src/inertia.c
index 918f9797e5..22cf235f20 100644
--- a/apps/plugins/puzzles/src/inertia.c
+++ b/apps/plugins/puzzles/src/inertia.c
@@ -168,19 +168,15 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = NULL;
     ret[2].type = C_END;
-    ret[2].sval = NULL;
-    ret[2].ival = 0;
 
     return ret;
 }
@@ -189,13 +185,13 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     /*
      * Avoid completely degenerate cases which only have one
@@ -589,7 +585,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return gengrid(params->w, params->h, rs);
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int w = params->w, h = params->h, wh = w*h;
     int starts = 0, gems = 0, i;
@@ -733,7 +729,7 @@ static int compare_integers(const void *av, const void *bv)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     int w = currstate->p.w, h = currstate->p.h, wh = w*h;
     int *nodes, *nodeindex, *edges, *backedges, *edgei, *backedgei, *circuit;
@@ -742,7 +738,8 @@ static char *solve_game(const game_state *state, const game_state *currstate,
     int *unvisited;
     int circuitlen, circuitsize;
     int head, tail, pass, i, j, n, x, y, d, dd;
-    char *err, *soln, *p;
+    const char *err;
+    char *soln, *p;
 
     /*
      * Before anything else, deal with the special case in which
@@ -1737,7 +1734,8 @@ static game_state *execute_move(const game_state *state, const char *move)
             assert(ret->solnpos < ret->soln->len); /* or gems == 0 */
             assert(!ret->dead); /* or not a solution */
         } else {
-            char *error = NULL, *soln = solve_game(NULL, ret, NULL, &error);
+            const char *error = NULL;
+            char *soln = solve_game(NULL, ret, NULL, &error);
             if (!error) {
                 install_new_solution(ret, soln);
                 sfree(soln);
diff --git a/apps/plugins/puzzles/src/keen.c b/apps/plugins/puzzles/src/keen.c
index fdaae32e5d..ec7af12985 100644
--- a/apps/plugins/puzzles/src/keen.c
+++ b/apps/plugins/puzzles/src/keen.c
@@ -183,23 +183,19 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Grid size";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Difficulty";
     ret[1].type = C_CHOICES;
-    ret[1].sval = DIFFCONFIG;
-    ret[1].ival = params->diff;
+    ret[1].u.choices.choicenames = DIFFCONFIG;
+    ret[1].u.choices.selected = params->diff;
 
     ret[2].name = "Multiplication only";
     ret[2].type = C_BOOLEAN;
-    ret[2].sval = NULL;
-    ret[2].ival = params->multiplication_only;
+    ret[2].u.boolean.bval = params->multiplication_only;
 
     ret[3].name = NULL;
     ret[3].type = C_END;
-    ret[3].sval = NULL;
-    ret[3].ival = 0;
 
     return ret;
 }
@@ -208,14 +204,14 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->diff = cfg[1].ival;
-    ret->multiplication_only = cfg[2].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->diff = cfg[1].u.choices.selected;
+    ret->multiplication_only = cfg[2].u.boolean.bval;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 3 || params->w > 9)
         return "Grid size must be between 3 and 9";
@@ -731,7 +727,7 @@ static char *encode_block_structure(char *p, int w, int *dsf)
     return q;
 }
 
-static char *parse_block_structure(const char **p, int w, int *dsf)
+static const char *parse_block_structure(const char **p, int w, int *dsf)
 {
     int a = w*w;
     int pos = 0;
@@ -1207,11 +1203,11 @@ done
  * Gameplay.
  */
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int w = params->w, a = w*w;
     int *dsf;
-    char *ret;
+    const char *ret;
     const char *p = desc;
     int i;
 
@@ -1349,7 +1345,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     int w = state->par.w, a = w*w;
     int i, ret;
@@ -1616,7 +1612,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                 ui->hpencil = 0;
             }
             ui->hcursor = 0;
-            return "";                 /* UI activity occurred */
+            return UI_UPDATE;
         }
         if (button == RIGHT_BUTTON) {
             /*
@@ -1636,19 +1632,19 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                 ui->hshow = 0;
             }
             ui->hcursor = 0;
-            return "";                 /* UI activity occurred */
+            return UI_UPDATE;
         }
     }
     if (IS_CURSOR_MOVE(button)) {
         move_cursor(button, &ui->hx, &ui->hy, w, w, 0);
         ui->hshow = ui->hcursor = 1;
-        return "";
+        return UI_UPDATE;
     }
     if (ui->hshow &&
         (button == CURSOR_SELECT)) {
         ui->hpencil = 1 - ui->hpencil;
         ui->hcursor = 1;
-        return "";
+        return UI_UPDATE;
     }
 
     if (ui->hshow &&
@@ -2383,7 +2379,8 @@ int main(int argc, char **argv)
 {
     game_params *p;
     game_state *s;
-    char *id = NULL, *desc, *err;
+    char *id = NULL, *desc;
+    const char *err;
     int grade = FALSE;
     int ret, diff, really_show_working = FALSE;
 
diff --git a/apps/plugins/puzzles/src/latin.c b/apps/plugins/puzzles/src/latin.c
index 03d78aff1f..50fae3cfea 100644
--- a/apps/plugins/puzzles/src/latin.c
+++ b/apps/plugins/puzzles/src/latin.c
@@ -73,7 +73,7 @@ void latin_solver_place(struct latin_solver *solver, int x, int y, int n)
 
 int latin_solver_elim(struct latin_solver *solver, int start, int step
 #ifdef STANDALONE_SOLVER
-                      , char *fmt, ...
+                      , const char *fmt, ...
 #endif
                       )
 {
@@ -150,7 +150,7 @@ int latin_solver_set(struct latin_solver *solver,
                      struct latin_solver_scratch *scratch,
                      int start, int step1, int step2
 #ifdef STANDALONE_SOLVER
-                     , char *fmt, ...
+                     , const char *fmt, ...
 #endif
                      )
 {
@@ -499,7 +499,7 @@ int latin_solver_forcing(struct latin_solver *solver,
                                 (xt == x || yt == y)) {
 #ifdef STANDALONE_SOLVER
                                 if (solver_show_working) {
-                                    char *sep = "";
+                                    const char *sep = "";
                                     int xl, yl;
                                     printf("%*sforcing chain, %s at ends of ",
                                            solver_recurse_depth*4, "",
@@ -775,7 +775,7 @@ static int latin_solver_recurse
 
 #ifdef STANDALONE_SOLVER
         if (solver_show_working) {
-            char *sep = "";
+            const char *sep = "";
             printf("%*srecursing on (%d,%d) [",
                    solver_recurse_depth*4, "", x+1, y+1);
             for (i = 0; i < j; i++) {
diff --git a/apps/plugins/puzzles/src/latin.h b/apps/plugins/puzzles/src/latin.h
index 4b09f16ce1..e13050e9a8 100644
--- a/apps/plugins/puzzles/src/latin.h
+++ b/apps/plugins/puzzles/src/latin.h
@@ -39,7 +39,7 @@ void latin_solver_place(struct latin_solver *solver, int x, int y, int n);
 /* Positional elimination. */
 int latin_solver_elim(struct latin_solver *solver, int start, int step
 #ifdef STANDALONE_SOLVER
-                      , char *fmt, ...
+                      , const char *fmt, ...
 #endif
                       );
 
@@ -49,7 +49,7 @@ int latin_solver_set(struct latin_solver *solver,
                      struct latin_solver_scratch *scratch,
                      int start, int step1, int step2
 #ifdef STANDALONE_SOLVER
-                     , char *fmt, ...
+                     , const char *fmt, ...
 #endif
                      );
 
diff --git a/apps/plugins/puzzles/src/lightup.c b/apps/plugins/puzzles/src/lightup.c
index 4dd46c8392..fd363e076e 100644
--- a/apps/plugins/puzzles/src/lightup.c
+++ b/apps/plugins/puzzles/src/lightup.c
@@ -299,37 +299,32 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "%age of black squares";
     ret[2].type = C_STRING;
     sprintf(buf, "%d", params->blackpc);
-    ret[2].sval = dupstr(buf);
-    ret[2].ival = 0;
+    ret[2].u.string.sval = dupstr(buf);
 
     ret[3].name = "Symmetry";
     ret[3].type = C_CHOICES;
-    ret[3].sval = ":None"
+    ret[3].u.choices.choicenames = ":None"
                   ":2-way mirror:2-way rotational"
                   ":4-way mirror:4-way rotational";
-    ret[3].ival = params->symm;
+    ret[3].u.choices.selected = params->symm;
 
     ret[4].name = "Difficulty";
     ret[4].type = C_CHOICES;
-    ret[4].sval = ":Easy:Tricky:Hard";
-    ret[4].ival = params->difficulty;
+    ret[4].u.choices.choicenames = ":Easy:Tricky:Hard";
+    ret[4].u.choices.selected = params->difficulty;
 
     ret[5].name = NULL;
     ret[5].type = C_END;
-    ret[5].sval = NULL;
-    ret[5].ival = 0;
 
     return ret;
 }
@@ -338,16 +333,16 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w =       atoi(cfg[0].sval);
-    ret->h =       atoi(cfg[1].sval);
-    ret->blackpc = atoi(cfg[2].sval);
-    ret->symm =    cfg[3].ival;
-    ret->difficulty = cfg[4].ival;
+    ret->w =       atoi(cfg[0].u.string.sval);
+    ret->h =       atoi(cfg[1].u.string.sval);
+    ret->blackpc = atoi(cfg[2].u.string.sval);
+    ret->symm =    cfg[3].u.choices.selected;
+    ret->difficulty = cfg[4].u.choices.selected;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 2 || params->h < 2)
         return "Width and height must be at least 2";
@@ -1629,7 +1624,7 @@ goodpuzzle:
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int i;
     for (i = 0; i < params->w*params->h; i++) {
@@ -1700,7 +1695,7 @@ static game_state *new_game(midend *me, const game_params *params,
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     game_state *solved;
     char *move = NULL, buf[80];
@@ -1882,7 +1877,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
     enum { NONE, FLIP_LIGHT, FLIP_IMPOSSIBLE } action = NONE;
     int cx = -1, cy = -1;
     unsigned int flags;
-    char buf[80], *nullret = NULL, *empty = "", c;
+    char buf[80], *nullret = UI_UPDATE, *empty = UI_UPDATE, c;
 
     if (button == LEFT_BUTTON || button == RIGHT_BUTTON) {
         if (ui->cur_visible)
@@ -2331,7 +2326,8 @@ int main(int argc, char **argv)
 {
     game_params *p;
     game_state *s;
-    char *id = NULL, *desc, *err, *result;
+    char *id = NULL, *desc, *result;
+    const char *err;
     int nsol, diff, really_verbose = 0;
     unsigned int sflags;
 
diff --git a/apps/plugins/puzzles/src/loopy.c b/apps/plugins/puzzles/src/loopy.c
index 92b27ab516..5f1940e945 100644
--- a/apps/plugins/puzzles/src/loopy.c
+++ b/apps/plugins/puzzles/src/loopy.c
@@ -232,7 +232,7 @@ struct game_drawstate {
     char *clue_satisfied;
 };
 
-static char *validate_desc(const game_params *params, const char *desc);
+static const char *validate_desc(const game_params *params, const char *desc);
 static int dot_order(const game_state* state, int i, char line_type);
 static int face_order(const game_state* state, int i, char line_type);
 static solver_state *solve_game_rec(const solver_state *sstate);
@@ -295,7 +295,7 @@ static grid_type grid_types[] = { GRIDLIST(GRID_GRIDTYPE) };
 #define NUM_GRID_TYPES (sizeof(grid_types) / sizeof(grid_types[0]))
 static const struct {
     int amin, omin;
-    char *aerr, *oerr;
+    const char *aerr, *oerr;
 } grid_size_limits[] = { GRIDLIST(GRID_SIZES) };
 
 /* Generates a (dynamically allocated) new grid, according to the
@@ -640,29 +640,25 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Grid type";
     ret[2].type = C_CHOICES;
-    ret[2].sval = GRID_CONFIGS;
-    ret[2].ival = params->type;
+    ret[2].u.choices.choicenames = GRID_CONFIGS;
+    ret[2].u.choices.selected = params->type;
 
     ret[3].name = "Difficulty";
     ret[3].type = C_CHOICES;
-    ret[3].sval = DIFFCONFIG;
-    ret[3].ival = params->diff;
+    ret[3].u.choices.choicenames = DIFFCONFIG;
+    ret[3].u.choices.selected = params->diff;
 
     ret[4].name = NULL;
     ret[4].type = C_END;
-    ret[4].sval = NULL;
-    ret[4].ival = 0;
 
     return ret;
 }
@@ -671,15 +667,15 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->type = cfg[2].ival;
-    ret->diff = cfg[3].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->type = cfg[2].u.choices.selected;
+    ret->diff = cfg[3].u.choices.selected;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->type < 0 || params->type >= NUM_GRID_TYPES)
         return "Illegal grid type";
@@ -760,11 +756,12 @@ static char *extract_grid_desc(const char **desc)
 
 /* We require that the params pass the test in validate_params and that the
  * description fills the entire game area */
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int count = 0;
     grid *g;
-    char *grid_desc, *ret;
+    char *grid_desc;
+    const char *ret;
 
     /* It's pretty inefficient to do this just for validation. All we need to
      * know is the precise number of faces. */
@@ -2912,7 +2909,7 @@ static solver_state *solve_game_rec(const solver_state *sstate_start)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     char *soln = NULL;
     solver_state *sstate, *new_sstate;
@@ -3691,7 +3688,8 @@ int main(int argc, char **argv)
 {
     game_params *p;
     game_state *s;
-    char *id = NULL, *desc, *err;
+    char *id = NULL, *desc;
+    const char *err;
     int grade = FALSE;
     int ret, diff;
 #if 0 /* verbose solver not supported here (yet) */
diff --git a/apps/plugins/puzzles/src/magnets.c b/apps/plugins/puzzles/src/magnets.c
index 553ca0d0da..ebb537663a 100644
--- a/apps/plugins/puzzles/src/magnets.c
+++ b/apps/plugins/puzzles/src/magnets.c
@@ -193,29 +193,24 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Difficulty";
     ret[2].type = C_CHOICES;
-    ret[2].sval = DIFFCONFIG;
-    ret[2].ival = params->diff;
+    ret[2].u.choices.choicenames = DIFFCONFIG;
+    ret[2].u.choices.selected = params->diff;
 
     ret[3].name = "Strip clues";
     ret[3].type = C_BOOLEAN;
-    ret[3].sval = NULL;
-    ret[3].ival = params->stripclues;
+    ret[3].u.boolean.bval = params->stripclues;
 
     ret[4].name = NULL;
     ret[4].type = C_END;
-    ret[4].sval = NULL;
-    ret[4].ival = 0;
 
     return ret;
 }
@@ -224,15 +219,15 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->diff = cfg[2].ival;
-    ret->stripclues = cfg[3].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->diff = cfg[2].u.choices.selected;
+    ret->stripclues = cfg[3].u.boolean.bval;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 2) return "Width must be at least one";
     if (params->h < 2) return "Height must be at least one";
@@ -539,7 +534,7 @@ done:
     return state;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     const char *prob;
     game_state *st = new_game_int(params, desc, &prob);
@@ -1455,7 +1450,7 @@ static void solve_from_aux(const game_state *state, const char *aux)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     game_state *solved = dup_game(currstate);
     char *move = NULL;
@@ -1804,11 +1799,11 @@ static char *interpret_move(const game_state *state, game_ui *ui,
     if (IS_CURSOR_MOVE(button)) {
         move_cursor(button, &ui->cur_x, &ui->cur_y, state->w, state->h, 0);
         ui->cur_visible = 1;
-        return "";
+        return UI_UPDATE;
     } else if (IS_CURSOR_SELECT(button)) {
         if (!ui->cur_visible) {
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
         action = (button == CURSOR_SELECT) ? CYCLE_MAGNET : CYCLE_NEUTRAL;
         gx = ui->cur_x;
@@ -1817,7 +1812,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                (button == LEFT_BUTTON || button == RIGHT_BUTTON)) {
         if (ui->cur_visible) {
             ui->cur_visible = 0;
-            nullret = "";
+            nullret = UI_UPDATE;
         }
         action = (button == LEFT_BUTTON) ? CYCLE_MAGNET : CYCLE_NEUTRAL;
     } else if (button == LEFT_BUTTON && is_clue(state, gx, gy)) {
@@ -2540,7 +2535,8 @@ static void start_soak(game_params *p, random_state *rs)
 int main(int argc, const char *argv[])
 {
     int print = 0, soak = 0, solved = 0, ret;
-    char *id = NULL, *desc, *desc_gen = NULL, *err, *aux = NULL;
+    char *id = NULL, *desc, *desc_gen = NULL, *aux = NULL;
+    const char *err;
     game_state *s = NULL;
     game_params *p = NULL;
     random_state *rs = NULL;
diff --git a/apps/plugins/puzzles/src/map.c b/apps/plugins/puzzles/src/map.c
index 54073bad0d..cdcd5861a8 100644
--- a/apps/plugins/puzzles/src/map.c
+++ b/apps/plugins/puzzles/src/map.c
@@ -213,30 +213,25 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Regions";
     ret[2].type = C_STRING;
     sprintf(buf, "%d", params->n);
-    ret[2].sval = dupstr(buf);
-    ret[2].ival = 0;
+    ret[2].u.string.sval = dupstr(buf);
 
     ret[3].name = "Difficulty";
     ret[3].type = C_CHOICES;
-    ret[3].sval = DIFFCONFIG;
-    ret[3].ival = params->diff;
+    ret[3].u.choices.choicenames = DIFFCONFIG;
+    ret[3].u.choices.selected = params->diff;
 
     ret[4].name = NULL;
     ret[4].type = C_END;
-    ret[4].sval = NULL;
-    ret[4].ival = 0;
 
     return ret;
 }
@@ -245,15 +240,15 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->n = atoi(cfg[2].sval);
-    ret->diff = cfg[3].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->n = atoi(cfg[2].u.string.sval);
+    ret->diff = cfg[3].u.choices.selected;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 2 || params->h < 2)
         return "Width and height must be at least two";
@@ -878,7 +873,7 @@ static const char colnames[FOUR] = { 'R', 'Y', 'G', 'B' };
 static int place_colour(struct solver_scratch *sc,
                         int *colouring, int index, int colour
 #ifdef SOLVER_DIAGNOSTICS
-                        , char *verb
+                        , const char *verb
 #endif
                         )
 {
@@ -925,7 +920,7 @@ static char *colourset(char *buf, int set)
 {
     int i;
     char *p = buf;
-    char *sep = "";
+    const char *sep = "";
 
     for (i = 0; i < FOUR; i++)
         if (set & (1 << i)) {
@@ -1219,7 +1214,8 @@ static int map_solver(struct solver_scratch *sc,
                                 (sc->possible[k] & currc)) {
 #ifdef SOLVER_DIAGNOSTICS
                                 if (verbose) {
-                                    char buf[80], *sep = "";
+                                    char buf[80];
+                                    const char *sep = "";
                                     int r;
 
                                     printf("%*sforcing chain, colour %s, ",
@@ -1704,8 +1700,8 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return ret;
 }
 
-static char *parse_edge_list(const game_params *params, const char **desc,
-                             int *map)
+static const char *parse_edge_list(const game_params *params,
+                                   const char **desc, int *map)
 {
     int w = params->w, h = params->h, wh = w*h, n = params->n;
     int i, k, pos, state;
@@ -1781,12 +1777,12 @@ static char *parse_edge_list(const game_params *params, const char **desc,
     return NULL;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int w = params->w, h = params->h, wh = w*h, n = params->n;
     int area;
     int *map;
-    char *ret;
+    const char *ret;
 
     map = snewn(2*wh, int);
     ret = parse_edge_list(params, &desc, map);
@@ -1846,7 +1842,7 @@ static game_state *new_game(midend *me, const game_params *params,
     p = desc;
 
     {
-        char *ret;
+        const char *ret;
         ret = parse_edge_list(params, &p, state->map->map);
         assert(!ret);
     }
@@ -2191,7 +2187,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     if (!aux) {
         /*
@@ -2375,7 +2371,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
      */
     if (button == 'l' || button == 'L') {
         ui->show_numbers = !ui->show_numbers;
-        return "";
+        return UI_UPDATE;
     }
 
     if (IS_CURSOR_MOVE(button)) {
@@ -2385,14 +2381,14 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         ui->cur_lastmove = button;
         ui->dragx = COORD(ui->cur_x) + TILESIZE/2 + EPSILON_X(button);
         ui->dragy = COORD(ui->cur_y) + TILESIZE/2 + EPSILON_Y(button);
-        return "";
+        return UI_UPDATE;
     }
     if (IS_CURSOR_SELECT(button)) {
         if (!ui->cur_visible) {
             ui->dragx = COORD(ui->cur_x) + TILESIZE/2 + EPSILON_X(ui->cur_lastmove);
             ui->dragy = COORD(ui->cur_y) + TILESIZE/2 + EPSILON_Y(ui->cur_lastmove);
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
         if (ui->drag_colour == -2) { /* not currently cursor-dragging, start. */
             int r = region_from_coords(state, ds, ui->dragx, ui->dragy);
@@ -2404,7 +2400,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                 ui->drag_pencil = 0;
             }
             ui->cur_moved = 0;
-            return "";
+            return UI_UPDATE;
         } else { /* currently cursor-dragging; drop the colour in the new region. */
             x = COORD(ui->cur_x) + TILESIZE/2 + EPSILON_X(ui->cur_lastmove);
             y = COORD(ui->cur_y) + TILESIZE/2 + EPSILON_Y(ui->cur_lastmove);
@@ -2430,14 +2426,14 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         ui->dragx = x;
         ui->dragy = y;
         ui->cur_visible = 0;
-        return "";
+        return UI_UPDATE;
     }
 
     if ((button == LEFT_DRAG || button == RIGHT_DRAG) &&
         ui->drag_colour > -2) {
         ui->dragx = x;
         ui->dragy = y;
-        return "";
+        return UI_UPDATE;
     }
 
     if ((button == LEFT_RELEASE || button == RIGHT_RELEASE) &&
@@ -2461,18 +2457,18 @@ drag_dropped:
         ui->drag_colour = -2;
 
         if (r < 0)
-            return "";                 /* drag into border; do nothing else */
+            return UI_UPDATE;          /* drag into border; do nothing else */
 
         if (state->map->immutable[r])
-            return "";                 /* can't change this region */
+            return UI_UPDATE;          /* can't change this region */
 
         if (state->colouring[r] == c && state->pencil[r] == p)
-            return "";                 /* don't _need_ to change this region */
+            return UI_UPDATE;          /* don't _need_ to change this region */
 
         if (alt_button) {
             if (state->colouring[r] >= 0) {
                 /* Can't pencil on a coloured region */
-                return "";
+                return UI_UPDATE;
             } else if (c >= 0) {
                 /* Right-dragging from colour to blank toggles one pencil */
                 p = state->pencil[r] ^ (1 << c);
@@ -3240,7 +3236,8 @@ int main(int argc, char **argv)
 {
     game_params *p;
     game_state *s;
-    char *id = NULL, *desc, *err;
+    char *id = NULL, *desc;
+    const char *err;
     int grade = FALSE;
     int ret, diff, really_verbose = FALSE;
     struct solver_scratch *sc;
diff --git a/apps/plugins/puzzles/src/maxflow.c b/apps/plugins/puzzles/src/maxflow.c
index 028946b9bd..97ae8c487d 100644
--- a/apps/plugins/puzzles/src/maxflow.c
+++ b/apps/plugins/puzzles/src/maxflow.c
@@ -80,7 +80,7 @@ int maxflow_with_scratch(void *scratch, int nv, int source, int sink,
         /*
          * Now do the BFS loop.
          */
-        while (head < tail && prev[sink] <= 0) {
+        while (head < tail && prev[sink] < 0) {
             from = todo[head++];
 
             /*
diff --git a/apps/plugins/puzzles/src/midend.c b/apps/plugins/puzzles/src/midend.c
index 09b59b25e2..4ccb1f94a0 100644
--- a/apps/plugins/puzzles/src/midend.c
+++ b/apps/plugins/puzzles/src/midend.c
@@ -63,6 +63,9 @@ struct midend {
     int nstates, statesize, statepos;
     struct midend_state_entry *states;
 
+    char *newgame_undo_buf;
+    int newgame_undo_len, newgame_undo_size;
+
     game_params *params, *curparams;
     game_drawstate *drawstate;
     game_ui *ui;
@@ -94,6 +97,30 @@ struct midend {
     } \
 } while (0)
 
+/*
+ * Structure storing all the decoded data from reading a serialised
+ * game. We keep it in one of these while we check its sanity, and
+ * only once we're completely satisfied do we install it all in the
+ * midend structure proper.
+ */
+struct deserialise_data {
+    char *seed, *parstr, *desc, *privdesc;
+    char *auxinfo, *uistr, *cparstr;
+    float elapsed;
+    game_params *params, *cparams;
+    game_ui *ui;
+    struct midend_state_entry *states;
+    int nstates, statepos;
+};
+
+/*
+ * Forward reference.
+ */
+static const char *midend_deserialise_internal(
+    midend *me, int (*read)(void *ctx, void *buf, int len), void *rctx,
+    const char *(*check)(void *ctx, midend *, const struct deserialise_data *),
+    void *cctx);
+
 void midend_reset_tilesize(midend *me)
 {
     me->preferred_tilesize = me->ourgame->preferred_tilesize;
@@ -131,6 +158,8 @@ midend *midend_new(frontend *fe, const game *ourgame,
     me->random = random_new(randseed, randseedsize);
     me->nstates = me->statesize = me->statepos = 0;
     me->states = NULL;
+    me->newgame_undo_buf = NULL;
+    me->newgame_undo_size = me->newgame_undo_len = 0;
     me->params = ourgame->default_params();
     me->game_id_change_notify_function = NULL;
     me->game_id_change_notify_ctx = NULL;
@@ -228,6 +257,7 @@ void midend_free(midend *me)
     if (me->drawing)
         drawing_free(me->drawing);
     random_free(me->random);
+    sfree(me->newgame_undo_buf);
     sfree(me->states);
     sfree(me->desc);
     sfree(me->privdesc);
@@ -354,8 +384,40 @@ void midend_force_redraw(midend *me)
     midend_redraw(me);
 }
 
+static void newgame_serialise_write(void *ctx, const void *buf, int len)
+{
+    midend *const me = ctx;
+    int new_len;
+
+    assert(len < INT_MAX - me->newgame_undo_len);
+    new_len = me->newgame_undo_len + len;
+    if (new_len > me->newgame_undo_size) {
+        me->newgame_undo_size = new_len + new_len / 4 + 1024;
+        me->newgame_undo_buf = sresize(me->newgame_undo_buf,
+                                       me->newgame_undo_size, char);
+    }
+    memcpy(me->newgame_undo_buf + me->newgame_undo_len, buf, len);
+    me->newgame_undo_len = new_len;
+}
+
 void midend_new_game(midend *me)
 {
+    me->newgame_undo_len = 0;
+    if (me->nstates != 0) {
+        /*
+         * Serialise the whole of the game that we're about to
+         * supersede, so that the 'New Game' action can be undone
+         * later. But if nstates == 0, that means there _isn't_ a
+         * current game (not even a starting position), because this
+         * is the initial call to midend_new_game when the midend is
+         * first set up; in that situation, we want to avoid writing
+         * out any serialisation, because it would be useless anyway
+         * and just confuse us into thinking we had something to undo
+         * to.
+         */
+        midend_serialise(me, newgame_serialise_write, me);
+    }
+
     midend_stop_anim(me);
     midend_free_game(me);
 
@@ -434,7 +496,8 @@ void midend_new_game(midend *me)
      */
     if (me->ourgame->can_solve && me->aux_info) {
         game_state *s;
-        char *msg, *movestr;
+        const char *msg;
+        char *movestr;
 
         msg = NULL;
         movestr = me->ourgame->solve(me->states[0].state,
@@ -469,7 +532,7 @@ void midend_new_game(midend *me)
 
 int midend_can_undo(midend *me)
 {
-    return (me->statepos > 1);
+    return (me->statepos > 1 || me->newgame_undo_len);
 }
 
 int midend_can_redo(midend *me)
@@ -477,8 +540,82 @@ int midend_can_redo(midend *me)
     return (me->statepos < me->nstates);
 }
 
+struct newgame_undo_deserialise_read_ctx {
+    midend *me;
+    int len, pos;
+};
+
+static int newgame_undo_deserialise_read(void *ctx, void *buf, int len)
+{
+    struct newgame_undo_deserialise_read_ctx *const rctx = ctx;
+    midend *const me = rctx->me;
+
+    int use = min(len, rctx->len - rctx->pos);
+    memcpy(buf, me->newgame_undo_buf + rctx->pos, use);
+    rctx->pos += use;
+    return use;
+}
+
+struct newgame_undo_deserialise_check_ctx {
+    int refused;
+};
+
+static const char *newgame_undo_deserialise_check(
+    void *vctx, midend *me, const struct deserialise_data *data)
+{
+    struct newgame_undo_deserialise_check_ctx *ctx =
+        (struct newgame_undo_deserialise_check_ctx *)vctx;
+    char *old, *new;
+
+    /*
+     * Undoing a New Game operation is only permitted if it doesn't
+     * change the game parameters. The point of having the ability at
+     * all is to recover from the momentary finger error of having hit
+     * the 'n' key (perhaps in place of some other nearby key), or hit
+     * the New Game menu item by mistake when aiming for the adjacent
+     * Restart; in both those situations, the game params are the same
+     * before and after the new-game operation.
+     *
+     * In principle, we could generalise this so that _any_ call to
+     * midend_new_game could be undone, but that would need all front
+     * ends to be alert to the possibility that any keystroke passed
+     * to midend_process_key might (if it turns out to have been one
+     * of the synonyms for undo, which the frontend doesn't
+     * necessarily check for) have various knock-on effects like
+     * needing to select a different preset in the game type menu, or
+     * even resizing the window. At least for the moment, it's easier
+     * not to do that, and to simply disallow any newgame-undo that is
+     * disruptive in either of those ways.
+     *
+     * We check both params and cparams, to be as safe as possible.
+     */
+
+    old = me->ourgame->encode_params(me->params, TRUE);
+    new = me->ourgame->encode_params(data->params, TRUE);
+    if (strcmp(old, new)) {
+        /* Set a flag to distinguish this deserialise failure
+         * from one due to faulty decoding */
+        ctx->refused = TRUE;
+        return "Undoing this new-game operation would change params";
+    }
+
+    old = me->ourgame->encode_params(me->curparams, TRUE);
+    new = me->ourgame->encode_params(data->cparams, TRUE);
+    if (strcmp(old, new)) {
+        ctx->refused = TRUE;
+        return "Undoing this new-game operation would change params";
+    }
+
+    /*
+     * Otherwise, fine, go ahead.
+     */
+    return NULL;
+}
+
 static int midend_undo(midend *me)
 {
+    const char *deserialise_error;
+
     if (me->statepos > 1) {
         if (me->ui)
             me->ourgame->changed_state(me->ui,
@@ -487,6 +624,36 @@ static int midend_undo(midend *me)
         me->statepos--;
         me->dir = -1;
         return 1;
+    } else if (me->newgame_undo_len) {
+        /* This undo cannot be undone with redo */
+        struct newgame_undo_deserialise_read_ctx rctx;
+        struct newgame_undo_deserialise_check_ctx cctx;
+        rctx.me = me;
+        rctx.len = me->newgame_undo_len; /* copy for reentrancy safety */
+        rctx.pos = 0;
+        cctx.refused = FALSE;
+        deserialise_error = midend_deserialise_internal(
+            me, newgame_undo_deserialise_read, &rctx,
+            newgame_undo_deserialise_check, &cctx);
+        if (cctx.refused) {
+            /*
+             * Our post-deserialisation check shows that we can't use
+             * this saved game after all. (deserialise_error will
+             * contain the dummy error message generated by our check
+             * function, which we ignore.)
+             */
+            return 0;
+        } else {
+            /*
+             * There should never be any _other_ deserialisation
+             * error, because this serialised data has been held in
+             * our memory since it was created, and hasn't had any
+             * opportunity to be corrupted on disk, accidentally
+             * replaced by the wrong file, etc., by user error.
+             */
+            assert(!deserialise_error);
+            return 1;
+        }
     } else
         return 0;
 }
@@ -629,7 +796,7 @@ static int midend_really_process_key(midend *me, int x, int y, int button)
         } else
             goto done;
     } else {
-        if (!*movestr)
+        if (movestr == UI_UPDATE)
             s = me->states[me->statepos-1].state;
         else {
             s = me->ourgame->execute_move(me->states[me->statepos-1].state,
@@ -1166,7 +1333,8 @@ void midend_request_id_changes(midend *me, void (*notify)(void *), void *ctx)
     me->game_id_change_notify_ctx = ctx;
 }
 
-void midend_supersede_game_desc(midend *me, char *desc, char *privdesc)
+void midend_supersede_game_desc(midend *me, const char *desc,
+                                const char *privdesc)
 {
     sfree(me->desc);
     sfree(me->privdesc);
@@ -1178,7 +1346,8 @@ void midend_supersede_game_desc(midend *me, char *desc, char *privdesc)
 
 config_item *midend_get_config(midend *me, int which, char **wintitle)
 {
-    char *titlebuf, *parstr, *rest;
+    char *titlebuf, *parstr;
+    const char *rest;
     config_item *ret;
     char sep;
 
@@ -1207,7 +1376,6 @@ config_item *midend_get_config(midend *me, int which, char **wintitle)
             ret[0].name = "Game random seed";
         else
             ret[0].name = "Game ID";
-        ret[0].ival = 0;
         /*
          * For CFG_DESC the text going in here will be a string
          * encoding of the restricted parameters, plus a colon,
@@ -1226,13 +1394,12 @@ config_item *midend_get_config(midend *me, int which, char **wintitle)
             rest = me->seedstr ? me->seedstr : "";
             sep = '#';
         }
-        ret[0].sval = snewn(strlen(parstr) + strlen(rest) + 2, char);
-        sprintf(ret[0].sval, "%s%c%s", parstr, sep, rest);
+        ret[0].u.string.sval = snewn(strlen(parstr) + strlen(rest) + 2, char);
+        sprintf(ret[0].u.string.sval, "%s%c%s", parstr, sep, rest);
         sfree(parstr);
 
         ret[1].type = C_END;
-        ret[1].name = ret[1].sval = NULL;
-        ret[1].ival = 0;
+        ret[1].name = NULL;
 
         return ret;
     }
@@ -1241,9 +1408,11 @@ config_item *midend_get_config(midend *me, int which, char **wintitle)
     return NULL;
 }
 
-static char *midend_game_id_int(midend *me, char *id, int defmode)
+static const char *midend_game_id_int(midend *me, const char *id, int defmode)
 {
-    char *error, *par, *desc, *seed;
+    const char *error;
+    char *par = NULL;
+    const char *desc, *seed;
     game_params *newcurparams, *newparams, *oldparams1, *oldparams2;
     int free_params;
 
@@ -1256,8 +1425,10 @@ static char *midend_game_id_int(midend *me, char *id, int defmode)
          * description. So `par' now points to the parameters
          * string, and `desc' to the description string.
          */
-        *desc++ = '\0';
-        par = id;
+        par = snewn(desc-id + 1, char);
+        strncpy(par, id, desc-id);
+        par[desc-id] = '\0';
+        desc++;
         seed = NULL;
     } else if (seed && (!desc || seed < desc)) {
         /*
@@ -1265,8 +1436,10 @@ static char *midend_game_id_int(midend *me, char *id, int defmode)
          * So `par' now points to the parameters string, and `seed'
          * to the seed string.
          */
-        *seed++ = '\0';
-        par = id;
+        par = snewn(seed-id + 1, char);
+        strncpy(par, id, seed-id);
+        par[seed-id] = '\0';
+        seed++;
         desc = NULL;
     } else {
         /*
@@ -1275,12 +1448,14 @@ static char *midend_game_id_int(midend *me, char *id, int defmode)
          */
         if (defmode == DEF_SEED) {
             seed = id;
-            par = desc = NULL;
+            par = NULL;
+            desc = NULL;
         } else if (defmode == DEF_DESC) {
             desc = id;
-            par = seed = NULL;
+            par = NULL;
+            seed = NULL;
         } else {
-            par = id;
+            par = dupstr(id);
             seed = desc = NULL;
         }
     }
@@ -1410,10 +1585,12 @@ static char *midend_game_id_int(midend *me, char *id, int defmode)
         me->genmode = GOT_SEED;
     }
 
+    sfree(par);
+
     return NULL;
 }
 
-char *midend_game_id(midend *me, char *id)
+const char *midend_game_id(midend *me, const char *id)
 {
     return midend_game_id_int(me, id, DEF_PARAMS);
 }
@@ -1446,9 +1623,9 @@ char *midend_get_random_seed(midend *me)
     return ret;
 }
 
-char *midend_set_config(midend *me, int which, config_item *cfg)
+const char *midend_set_config(midend *me, int which, config_item *cfg)
 {
-    char *error;
+    const char *error;
     game_params *params;
 
     switch (which) {
@@ -1467,7 +1644,7 @@ char *midend_set_config(midend *me, int which, config_item *cfg)
 
       case CFG_SEED:
       case CFG_DESC:
-        error = midend_game_id_int(me, cfg[0].sval,
+        error = midend_game_id_int(me, cfg[0].u.string.sval,
                                    (which == CFG_SEED ? DEF_SEED : DEF_DESC));
         if (error)
             return error;
@@ -1494,10 +1671,11 @@ char *midend_text_format(midend *me)
         return NULL;
 }
 
-char *midend_solve(midend *me)
+const char *midend_solve(midend *me)
 {
     game_state *s;
-    char *msg, *movestr;
+    const char *msg;
+    char *movestr;
 
     if (!me->ourgame->can_solve)
         return "This game does not support the Solve operation";
@@ -1509,6 +1687,7 @@ char *midend_solve(midend *me)
     movestr = me->ourgame->solve(me->states[0].state,
                                  me->states[me->statepos-1].state,
                                  me->aux_info, &msg);
+    assert(movestr != UI_UPDATE);
     if (!movestr) {
         if (!msg)
             msg = "Solve operation failed";   /* _shouldn't_ happen, but can */
@@ -1566,7 +1745,7 @@ int midend_status(midend *me)
     return me->ourgame->status(me->states[me->statepos-1].state);
 }
 
-char *midend_rewrite_statusbar(midend *me, char *text)
+char *midend_rewrite_statusbar(midend *me, const char *text)
 {
     /*
      * An important special case is that we are occasionally called
@@ -1600,7 +1779,7 @@ char *midend_rewrite_statusbar(midend *me, char *text)
 #define SERIALISE_VERSION "1"
 
 void midend_serialise(midend *me,
-                      void (*write)(void *ctx, void *buf, int len),
+                      void (*write)(void *ctx, const void *buf, int len),
                       void *wctx)
 {
     int i;
@@ -1616,7 +1795,7 @@ void midend_serialise(midend *me,
      */
 #define wr(h,s) do { \
     char hbuf[80]; \
-    char *str = (s); \
+    const char *str = (s); \
     char lbuf[9];                               \
     copy_left_justified(lbuf, sizeof(lbuf), h); \
     sprintf(hbuf, "%s:%d:", lbuf, (int)strlen(str)); \
@@ -1748,39 +1927,43 @@ void midend_serialise(midend *me,
 }
 
 /*
- * This function returns NULL on success, or an error message.
+ * Internal version of midend_deserialise, taking an extra check
+ * function to be called just before beginning to install things in
+ * the midend.
+ *
+ * Like midend_deserialise proper, this function returns NULL on
+ * success, or an error message.
  */
-char *midend_deserialise(midend *me,
-                         int (*read)(void *ctx, void *buf, int len),
-                         void *rctx)
+static const char *midend_deserialise_internal(
+    midend *me, int (*read)(void *ctx, void *buf, int len), void *rctx,
+    const char *(*check)(void *ctx, midend *, const struct deserialise_data *),
+    void *cctx)
 {
-    int nstates = 0, statepos = -1, gotstates = 0;
+    struct deserialise_data data;
+    int gotstates = 0;
     int started = FALSE;
     int i;
 
     char *val = NULL;
     /* Initially all errors give the same report */
-    char *ret = "Data does not appear to be a saved game file";
+    const char *ret = "Data does not appear to be a saved game file";
 
-    /*
-     * We construct all the new state in local variables while we
-     * check its sanity. Only once we have finished reading the
-     * serialised data and detected no errors at all do we start
-     * modifying stuff in the midend passed in.
-     */
-    char *seed = NULL, *parstr = NULL, *desc = NULL, *privdesc = NULL;
-    char *auxinfo = NULL, *uistr = NULL, *cparstr = NULL;
-    float elapsed = 0.0F;
-    game_params *params = NULL, *cparams = NULL;
-    game_ui *ui = NULL;
-    struct midend_state_entry *states = NULL;
+    data.seed = data.parstr = data.desc = data.privdesc = NULL;
+    data.auxinfo = data.uistr = data.cparstr = NULL;
+    data.elapsed = 0.0F;
+    data.params = data.cparams = NULL;
+    data.ui = NULL;
+    data.states = NULL;
+    data.nstates = 0;
+    data.statepos = -1;
 
     /*
      * Loop round and round reading one key/value pair at a time
      * from the serialised stream, until we have enough game states
      * to finish.
      */
-    while (nstates <= 0 || statepos < 0 || gotstates < nstates-1) {
+    while (data.nstates <= 0 || data.statepos < 0 ||
+           gotstates < data.nstates-1) {
         char key[9], c;
         int len;
 
@@ -1852,24 +2035,24 @@ char *midend_deserialise(midend *me,
                     goto cleanup;
                 }
             } else if (!strcmp(key, "PARAMS")) {
-                sfree(parstr);
-                parstr = val;
+                sfree(data.parstr);
+                data.parstr = val;
                 val = NULL;
             } else if (!strcmp(key, "CPARAMS")) {
-                sfree(cparstr);
-                cparstr = val;
+                sfree(data.cparstr);
+                data.cparstr = val;
                 val = NULL;
             } else if (!strcmp(key, "SEED")) {
-                sfree(seed);
-                seed = val;
+                sfree(data.seed);
+                data.seed = val;
                 val = NULL;
             } else if (!strcmp(key, "DESC")) {
-                sfree(desc);
-                desc = val;
+                sfree(data.desc);
+                data.desc = val;
                 val = NULL;
             } else if (!strcmp(key, "PRIVDESC")) {
-                sfree(privdesc);
-                privdesc = val;
+                sfree(data.privdesc);
+                data.privdesc = val;
                 val = NULL;
             } else if (!strcmp(key, "AUXINFO")) {
                 unsigned char *tmp;
@@ -1877,49 +2060,49 @@ char *midend_deserialise(midend *me,
                 tmp = hex2bin(val, len);
                 obfuscate_bitmap(tmp, len*8, TRUE);
 
-                sfree(auxinfo);
-                auxinfo = snewn(len + 1, char);
-                memcpy(auxinfo, tmp, len);
-                auxinfo[len] = '\0';
+                sfree(data.auxinfo);
+                data.auxinfo = snewn(len + 1, char);
+                memcpy(data.auxinfo, tmp, len);
+                data.auxinfo[len] = '\0';
                 sfree(tmp);
             } else if (!strcmp(key, "UI")) {
-                sfree(uistr);
-                uistr = val;
+                sfree(data.uistr);
+                data.uistr = val;
                 val = NULL;
             } else if (!strcmp(key, "TIME")) {
-                elapsed = (float)atof(val);
+                data.elapsed = (float)atof(val);
             } else if (!strcmp(key, "NSTATES")) {
-                nstates = atoi(val);
-                if (nstates <= 0) {
+                data.nstates = atoi(val);
+                if (data.nstates <= 0) {
                     ret = "Number of states in save file was negative";
                     goto cleanup;
                 }
-                if (states) {
+                if (data.states) {
                     ret = "Two state counts provided in save file";
                     goto cleanup;
                 }
-                states = snewn(nstates, struct midend_state_entry);
-                for (i = 0; i < nstates; i++) {
-                    states[i].state = NULL;
-                    states[i].movestr = NULL;
-                    states[i].movetype = NEWGAME;
+                data.states = snewn(data.nstates, struct midend_state_entry);
+                for (i = 0; i < data.nstates; i++) {
+                    data.states[i].state = NULL;
+                    data.states[i].movestr = NULL;
+                    data.states[i].movetype = NEWGAME;
                 }
             } else if (!strcmp(key, "STATEPOS")) {
-                statepos = atoi(val);
+                data.statepos = atoi(val);
             } else if (!strcmp(key, "MOVE")) {
                 gotstates++;
-                states[gotstates].movetype = MOVE;
-                states[gotstates].movestr = val;
+                data.states[gotstates].movetype = MOVE;
+                data.states[gotstates].movestr = val;
                 val = NULL;
             } else if (!strcmp(key, "SOLVE")) {
                 gotstates++;
-                states[gotstates].movetype = SOLVE;
-                states[gotstates].movestr = val;
+                data.states[gotstates].movetype = SOLVE;
+                data.states[gotstates].movestr = val;
                 val = NULL;
             } else if (!strcmp(key, "RESTART")) {
                 gotstates++;
-                states[gotstates].movetype = RESTART;
-                states[gotstates].movestr = val;
+                data.states[gotstates].movetype = RESTART;
+                data.states[gotstates].movestr = val;
                 val = NULL;
             }
         }
@@ -1928,68 +2111,77 @@ char *midend_deserialise(midend *me,
         val = NULL;
     }
 
-    params = me->ourgame->default_params();
-    me->ourgame->decode_params(params, parstr);
-    if (me->ourgame->validate_params(params, TRUE)) {
+    data.params = me->ourgame->default_params();
+    me->ourgame->decode_params(data.params, data.parstr);
+    if (me->ourgame->validate_params(data.params, TRUE)) {
         ret = "Long-term parameters in save file are invalid";
         goto cleanup;
     }
-    cparams = me->ourgame->default_params();
-    me->ourgame->decode_params(cparams, cparstr);
-    if (me->ourgame->validate_params(cparams, FALSE)) {
+    data.cparams = me->ourgame->default_params();
+    me->ourgame->decode_params(data.cparams, data.cparstr);
+    if (me->ourgame->validate_params(data.cparams, FALSE)) {
         ret = "Short-term parameters in save file are invalid";
         goto cleanup;
     }
-    if (seed && me->ourgame->validate_params(cparams, TRUE)) {
+    if (data.seed && me->ourgame->validate_params(data.cparams, TRUE)) {
         /*
          * The seed's no use with this version, but we can perfectly
          * well use the rest of the data.
          */
-        sfree(seed);
-        seed = NULL;
+        sfree(data.seed);
+        data.seed = NULL;
     }
-    if (!desc) {
+    if (!data.desc) {
         ret = "Game description in save file is missing";
         goto cleanup;
-    } else if (me->ourgame->validate_desc(params, desc)) {
+    } else if (me->ourgame->validate_desc(data.cparams, data.desc)) {
         ret = "Game description in save file is invalid";
         goto cleanup;
     }
-    if (privdesc && me->ourgame->validate_desc(params, privdesc)) {
+    if (data.privdesc &&
+        me->ourgame->validate_desc(data.cparams, data.privdesc)) {
         ret = "Game private description in save file is invalid";
         goto cleanup;
     }
-    if (statepos < 0 || statepos >= nstates) {
+    if (data.statepos < 0 || data.statepos >= data.nstates) {
         ret = "Game position in save file is out of range";
     }
 
-    states[0].state = me->ourgame->new_game(me, params,
-                                            privdesc ? privdesc : desc);
-    for (i = 1; i < nstates; i++) {
-        assert(states[i].movetype != NEWGAME);
-        switch (states[i].movetype) {
+    data.states[0].state = me->ourgame->new_game(
+        me, data.cparams, data.privdesc ? data.privdesc : data.desc);
+    for (i = 1; i < data.nstates; i++) {
+        assert(data.states[i].movetype != NEWGAME);
+        switch (data.states[i].movetype) {
           case MOVE:
           case SOLVE:
-            states[i].state = me->ourgame->execute_move(states[i-1].state,
-                                                        states[i].movestr);
-            if (states[i].state == NULL) {
+            data.states[i].state = me->ourgame->execute_move(
+                data.states[i-1].state, data.states[i].movestr);
+            if (data.states[i].state == NULL) {
                 ret = "Save file contained an invalid move";
                 goto cleanup;
             }
             break;
           case RESTART:
-            if (me->ourgame->validate_desc(params, states[i].movestr)) {
+            if (me->ourgame->validate_desc(
+                    data.cparams, data.states[i].movestr)) {
                 ret = "Save file contained an invalid restart move";
                 goto cleanup;
             }
-            states[i].state = me->ourgame->new_game(me, params,
-                                                    states[i].movestr);
+            data.states[i].state = me->ourgame->new_game(
+                me, data.cparams, data.states[i].movestr);
             break;
         }
     }
 
-    ui = me->ourgame->new_ui(states[0].state);
-    me->ourgame->decode_ui(ui, uistr);
+    data.ui = me->ourgame->new_ui(data.states[0].state);
+    me->ourgame->decode_ui(data.ui, data.uistr);
+
+    /*
+     * Run the externally provided check function, and abort if it
+     * returns an error message.
+     */
+    if (check && (ret = check(cctx, me, &data)) != NULL)
+        goto cleanup;            /* error message is already in ret */
 
     /*
      * Now we've run out of possible error conditions, so we're
@@ -2002,45 +2194,54 @@ char *midend_deserialise(midend *me,
         char *tmp;
 
         tmp = me->desc;
-        me->desc = desc;
-        desc = tmp;
+        me->desc = data.desc;
+        data.desc = tmp;
 
         tmp = me->privdesc;
-        me->privdesc = privdesc;
-        privdesc = tmp;
+        me->privdesc = data.privdesc;
+        data.privdesc = tmp;
 
         tmp = me->seedstr;
-        me->seedstr = seed;
-        seed = tmp;
+        me->seedstr = data.seed;
+        data.seed = tmp;
 
         tmp = me->aux_info;
-        me->aux_info = auxinfo;
-        auxinfo = tmp;
+        me->aux_info = data.auxinfo;
+        data.auxinfo = tmp;
     }
 
     me->genmode = GOT_NOTHING;
 
-    me->statesize = nstates;
-    nstates = me->nstates;
+    me->statesize = data.nstates;
+    data.nstates = me->nstates;
     me->nstates = me->statesize;
     {
         struct midend_state_entry *tmp;
         tmp = me->states;
-        me->states = states;
-        states = tmp;
+        me->states = data.states;
+        data.states = tmp;
     }
-    me->statepos = statepos;
+    me->statepos = data.statepos;
+
+    /*
+     * Don't save the "new game undo" state.  So "new game" twice or
+     * (in some environments) switching away and back, will make a
+     * "new game" irreversible.  Maybe in the future we will have a
+     * more sophisticated way to decide when to discard the previous
+     * game state.
+     */
+    me->newgame_undo_len = 0;
 
     {
         game_params *tmp;
 
         tmp = me->params;
-        me->params = params;
-        params = tmp;
+        me->params = data.params;
+        data.params = tmp;
 
         tmp = me->curparams;
-        me->curparams = cparams;
-        cparams = tmp;
+        me->curparams = data.cparams;
+        data.cparams = tmp;
     }
 
     me->oldstate = NULL;
@@ -2051,11 +2252,11 @@ char *midend_deserialise(midend *me,
         game_ui *tmp;
 
         tmp = me->ui;
-        me->ui = ui;
-        ui = tmp;
+        me->ui = data.ui;
+        data.ui = tmp;
     }
 
-    me->elapsed = elapsed;
+    me->elapsed = data.elapsed;
     me->pressed_mouse_button = 0;
 
     midend_set_timer(me);
@@ -2073,33 +2274,39 @@ char *midend_deserialise(midend *me,
 
     cleanup:
     sfree(val);
-    sfree(seed);
-    sfree(parstr);
-    sfree(cparstr);
-    sfree(desc);
-    sfree(privdesc);
-    sfree(auxinfo);
-    sfree(uistr);
-    if (params)
-        me->ourgame->free_params(params);
-    if (cparams)
-        me->ourgame->free_params(cparams);
-    if (ui)
-        me->ourgame->free_ui(ui);
-    if (states) {
+    sfree(data.seed);
+    sfree(data.parstr);
+    sfree(data.cparstr);
+    sfree(data.desc);
+    sfree(data.privdesc);
+    sfree(data.auxinfo);
+    sfree(data.uistr);
+    if (data.params)
+        me->ourgame->free_params(data.params);
+    if (data.cparams)
+        me->ourgame->free_params(data.cparams);
+    if (data.ui)
+        me->ourgame->free_ui(data.ui);
+    if (data.states) {
         int i;
 
-        for (i = 0; i < nstates; i++) {
-            if (states[i].state)
-                me->ourgame->free_game(states[i].state);
-            sfree(states[i].movestr);
+        for (i = 0; i < data.nstates; i++) {
+            if (data.states[i].state)
+                me->ourgame->free_game(data.states[i].state);
+            sfree(data.states[i].movestr);
         }
-        sfree(states);
+        sfree(data.states);
     }
 
     return ret;
 }
 
+const char *midend_deserialise(
+    midend *me, int (*read)(void *ctx, void *buf, int len), void *rctx)
+{
+    return midend_deserialise_internal(me, read, rctx, NULL, NULL);
+}
+
 /*
  * This function examines a saved game file just far enough to
  * determine which game type it contains. It returns NULL on success
@@ -2107,15 +2314,16 @@ char *midend_deserialise(midend *me,
  * allocated and should be caller-freed), or an error message on
  * failure.
  */
-char *identify_game(char **name, int (*read)(void *ctx, void *buf, int len),
-                    void *rctx)
+const char *identify_game(char **name,
+                          int (*read)(void *ctx, void *buf, int len),
+                          void *rctx)
 {
     int nstates = 0, statepos = -1, gotstates = 0;
     int started = FALSE;
 
     char *val = NULL;
     /* Initially all errors give the same report */
-    char *ret = "Data does not appear to be a saved game file";
+    const char *ret = "Data does not appear to be a saved game file";
 
     *name = NULL;
 
@@ -2205,7 +2413,7 @@ char *identify_game(char **name, int (*read)(void *ctx, void *buf, int len),
     return ret;
 }
 
-char *midend_print_puzzle(midend *me, document *doc, int with_soln)
+const char *midend_print_puzzle(midend *me, document *doc, int with_soln)
 {
     game_state *soln = NULL;
 
@@ -2213,7 +2421,8 @@ char *midend_print_puzzle(midend *me, document *doc, int with_soln)
         return "No game set up to print";/* _shouldn't_ happen! */
 
     if (with_soln) {
-        char *msg, *movestr;
+        const char *msg;
+        char *movestr;
 
         if (!me->ourgame->can_solve)
             return "This game does not support the Solve operation";
diff --git a/apps/plugins/puzzles/src/mines.c b/apps/plugins/puzzles/src/mines.c
index 107b3ba159..340bb4b8d3 100644
--- a/apps/plugins/puzzles/src/mines.c
+++ b/apps/plugins/puzzles/src/mines.c
@@ -203,30 +203,24 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Mines";
     ret[2].type = C_STRING;
     sprintf(buf, "%d", params->n);
-    ret[2].sval = dupstr(buf);
-    ret[2].ival = 0;
+    ret[2].u.string.sval = dupstr(buf);
 
     ret[3].name = "Ensure solubility";
     ret[3].type = C_BOOLEAN;
-    ret[3].sval = NULL;
-    ret[3].ival = params->unique;
+    ret[3].u.boolean.bval = params->unique;
 
     ret[4].name = NULL;
     ret[4].type = C_END;
-    ret[4].sval = NULL;
-    ret[4].ival = 0;
 
     return ret;
 }
@@ -235,17 +229,17 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->n = atoi(cfg[2].sval);
-    if (strchr(cfg[2].sval, '%'))
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->n = atoi(cfg[2].u.string.sval);
+    if (strchr(cfg[2].u.string.sval, '%'))
         ret->n = ret->n * (ret->w * ret->h) / 100;
-    ret->unique = cfg[3].ival;
+    ret->unique = cfg[3].u.boolean.bval;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     /*
      * Lower limit on grid size: each dimension must be at least 3.
@@ -1996,7 +1990,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     }
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int wh = params->w * params->h;
     int x, y;
@@ -2306,7 +2300,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     if (!state->layout->mines) {
         *error = "Game has not been started yet";
@@ -2434,14 +2428,14 @@ static char *interpret_move(const game_state *from, game_ui *ui,
     if (IS_CURSOR_MOVE(button)) {
         move_cursor(button, &ui->cur_x, &ui->cur_y, from->w, from->h, 0);
         ui->cur_visible = 1;
-        return "";
+        return UI_UPDATE;
     }
     if (IS_CURSOR_SELECT(button)) {
         int v = from->grid[ui->cur_y * from->w + ui->cur_x];
 
         if (!ui->cur_visible) {
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
         if (button == CURSOR_SELECT2) {
             /* As for RIGHT_BUTTON; only works on covered square. */
@@ -2481,7 +2475,7 @@ static char *interpret_move(const game_state *from, game_ui *ui,
         else if (button == MIDDLE_BUTTON)
             ui->validradius = 1;
         ui->cur_visible = 0;
-        return "";
+        return UI_UPDATE;
     }
 
     if (button == RIGHT_BUTTON) {
@@ -2509,10 +2503,10 @@ static char *interpret_move(const game_state *from, game_ui *ui,
 
         /*
          * At this stage we must never return NULL: we have adjusted
-         * the ui, so at worst we return "".
+         * the ui, so at worst we return UI_UPDATE.
          */
         if (cx < 0 || cx >= from->w || cy < 0 || cy >= from->h)
-            return "";
+            return UI_UPDATE;
 
         /*
          * Left-clicking on a covered square opens a tile. Not
@@ -2566,7 +2560,7 @@ uncover:
                  * can.
                  */
                 char *p = buf;
-                char *sep = "";
+                const char *sep = "";
 
                 for (dy = -1; dy <= +1; dy++)
                     for (dx = -1; dx <= +1; dx++)
@@ -2590,7 +2584,7 @@ uncover:
             }
         }
 
-        return "";
+        return UI_UPDATE;
     }
 }
 
@@ -3235,7 +3229,8 @@ int main(int argc, char **argv)
 {
     game_params *p;
     game_state *s;
-    char *id = NULL, *desc, *err;
+    char *id = NULL, *desc;
+    const char *err;
     int y, x;
 
     while (--argc > 0) {
diff --git a/apps/plugins/puzzles/src/misc.c b/apps/plugins/puzzles/src/misc.c
index 816d47e43a..83671a2744 100644
--- a/apps/plugins/puzzles/src/misc.c
+++ b/apps/plugins/puzzles/src/misc.c
@@ -9,13 +9,15 @@
 
 #include "puzzles.h"
 
+char UI_UPDATE[] = "";
+
 void free_cfg(config_item *cfg)
 {
     config_item *i;
 
     for (i = cfg; i->type != C_END; i++)
         if (i->type == C_STRING)
-            sfree(i->sval);
+            sfree(i->u.string.sval);
     sfree(cfg);
 }
 
@@ -349,7 +351,7 @@ void pos2c(int w, int h, int pos, int *cx, int *cy)
 
 void draw_text_outline(drawing *dr, int x, int y, int fonttype,
                        int fontsize, int align,
-                       int text_colour, int outline_colour, char *text)
+                       int text_colour, int outline_colour, const char *text)
 {
     if (outline_colour > -1) {
         draw_text(dr, x-1, y, fonttype, fontsize, align, outline_colour, text);
diff --git a/apps/plugins/puzzles/src/nestedvm.c b/apps/plugins/puzzles/src/nestedvm.c
index f7a2ae8ec5..0ad0f3fab4 100644
--- a/apps/plugins/puzzles/src/nestedvm.c
+++ b/apps/plugins/puzzles/src/nestedvm.c
@@ -17,7 +17,7 @@
 extern void _pause();
 extern int _call_java(int cmd, int arg1, int arg2, int arg3);
 
-void fatal(char *fmt, ...)
+void fatal(const char *fmt, ...)
 {
     va_list ap;
     fprintf(stderr, "fatal error: ");
@@ -53,7 +53,7 @@ void frontend_default_colour(frontend *fe, float *output)
     output[0] = output[1]= output[2] = 0.8f;
 }
 
-void nestedvm_status_bar(void *handle, char *text)
+void nestedvm_status_bar(void *handle, const char *text)
 {
     _call_java(4,0,(int)text,0);
 }
@@ -79,7 +79,7 @@ void nestedvm_unclip(void *handle)
 }
 
 void nestedvm_draw_text(void *handle, int x, int y, int fonttype, int fontsize,
-                   int align, int colour, char *text)
+                        int align, int colour, const char *text)
 {
     frontend *fe = (frontend *)handle;
     _call_java(5, x + fe->ox, y + fe->oy, 
@@ -259,7 +259,7 @@ void activate_timer(frontend *fe)
 void jcallback_config_ok()
 {
     frontend *fe = (frontend *)_fe;
-    char *err;
+    const char *err;
 
     err = midend_set_config(fe->me, fe->cfg_which, fe->cfg);
 
@@ -273,19 +273,22 @@ void jcallback_config_ok()
 void jcallback_config_set_string(int item_ptr, int char_ptr) {
     config_item *i = (config_item *)item_ptr;
     char* newval = (char*) char_ptr;
-    sfree(i->sval);
-    i->sval = dupstr(newval);
+    assert(i->type == C_STRING);
+    sfree(i->u.string.sval);
+    i->u.string.sval = dupstr(newval);
     free(newval);
 }
 
 void jcallback_config_set_boolean(int item_ptr, int selected) {
     config_item *i = (config_item *)item_ptr;
-    i->ival = selected != 0 ? TRUE : FALSE;
+    assert(i->type == C_BOOLEAN);
+    i->u.boolean.bval = selected != 0 ? TRUE : FALSE;
 }
 
 void jcallback_config_set_choice(int item_ptr, int selected) {
     config_item *i = (config_item *)item_ptr;
-    i->ival = selected;
+    assert(i->type == C_CHOICES);
+    i->u.choices.selected = selected;
 }
 
 static int get_config(frontend *fe, int which)
@@ -298,7 +301,18 @@ static int get_config(frontend *fe, int which)
     _call_java(10, (int)title, 0, 0);
     for (i = fe->cfg; i->type != C_END; i++) {
         _call_java(5, (int)i, i->type, (int)i->name);
-        _call_java(11, (int)i->sval, i->ival, 0);
+        switch (i->type) {
+          case C_STRING:
+            _call_java(11, (int)i->u.string.sval, 0, 0);
+            break;
+          case C_BOOLEAN:
+            _call_java(11, 0, i->u.boolean.bval, 0);
+            break;
+          case C_CHOICES:
+            _call_java(11, (int)i->u.choices.choicenames,
+                       i->u.choices.selected, 0);
+            break;
+        }
     }
     _call_java(12,0,0,0);
     free_cfg(fe->cfg);
@@ -363,7 +377,7 @@ int jcallback_preset_event(int ptr_game_params)
 int jcallback_solve_event()
 {
     frontend *fe = (frontend *)_fe;
-    char *msg;
+    const char *msg;
 
     msg = midend_solve(fe->me);
 
diff --git a/apps/plugins/puzzles/src/net.c b/apps/plugins/puzzles/src/net.c
index 0b3b82446d..ab2425e4e7 100644
--- a/apps/plugins/puzzles/src/net.c
+++ b/apps/plugins/puzzles/src/net.c
@@ -270,35 +270,28 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->width);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->height);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Walls wrap around";
     ret[2].type = C_BOOLEAN;
-    ret[2].sval = NULL;
-    ret[2].ival = params->wrapping;
+    ret[2].u.boolean.bval = params->wrapping;
 
     ret[3].name = "Barrier probability";
     ret[3].type = C_STRING;
     ftoa(buf, params->barrier_probability);
-    ret[3].sval = dupstr(buf);
-    ret[3].ival = 0;
+    ret[3].u.string.sval = dupstr(buf);
 
     ret[4].name = "Ensure unique solution";
     ret[4].type = C_BOOLEAN;
-    ret[4].sval = NULL;
-    ret[4].ival = params->unique;
+    ret[4].u.boolean.bval = params->unique;
 
     ret[5].name = NULL;
     ret[5].type = C_END;
-    ret[5].sval = NULL;
-    ret[5].ival = 0;
 
     return ret;
 }
@@ -307,16 +300,16 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->width = atoi(cfg[0].sval);
-    ret->height = atoi(cfg[1].sval);
-    ret->wrapping = cfg[2].ival;
-    ret->barrier_probability = (float)atof(cfg[3].sval);
-    ret->unique = cfg[4].ival;
+    ret->width = atoi(cfg[0].u.string.sval);
+    ret->height = atoi(cfg[1].u.string.sval);
+    ret->wrapping = cfg[2].u.boolean.bval;
+    ret->barrier_probability = (float)atof(cfg[3].u.string.sval);
+    ret->unique = cfg[4].u.boolean.bval;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->width <= 0 || params->height <= 0)
         return "Width and height must both be greater than zero";
@@ -1601,7 +1594,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return desc;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int w = params->width, h = params->height;
     int i;
@@ -1752,7 +1745,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     unsigned char *tiles;
     char *ret;
@@ -2099,7 +2092,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
 
         if (ui->cur_visible) {
             ui->cur_visible = FALSE;
-            nullret = "";
+            nullret = UI_UPDATE;
         }
 
         /*
@@ -2339,7 +2332,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             OFFSET(ui->cur_x, ui->cur_y, ui->cur_x, ui->cur_y, dir, state);
             ui->cur_visible = TRUE;
         }
-        return "";
+        return UI_UPDATE;
     } else {
         return NULL;
     }
diff --git a/apps/plugins/puzzles/src/netslide.c b/apps/plugins/puzzles/src/netslide.c
index bb9b0999ea..d4d9856295 100644
--- a/apps/plugins/puzzles/src/netslide.c
+++ b/apps/plugins/puzzles/src/netslide.c
@@ -265,36 +265,29 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->width);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->height);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Walls wrap around";
     ret[2].type = C_BOOLEAN;
-    ret[2].sval = NULL;
-    ret[2].ival = params->wrapping;
+    ret[2].u.boolean.bval = params->wrapping;
 
     ret[3].name = "Barrier probability";
     ret[3].type = C_STRING;
     ftoa(buf, params->barrier_probability);
-    ret[3].sval = dupstr(buf);
-    ret[3].ival = 0;
+    ret[3].u.string.sval = dupstr(buf);
 
     ret[4].name = "Number of shuffling moves";
     ret[4].type = C_STRING;
     sprintf(buf, "%d", params->movetarget);
-    ret[4].sval = dupstr(buf);
-    ret[4].ival = 0;
+    ret[4].u.string.sval = dupstr(buf);
 
     ret[5].name = NULL;
     ret[5].type = C_END;
-    ret[5].sval = NULL;
-    ret[5].ival = 0;
 
     return ret;
 }
@@ -303,16 +296,16 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->width = atoi(cfg[0].sval);
-    ret->height = atoi(cfg[1].sval);
-    ret->wrapping = cfg[2].ival;
-    ret->barrier_probability = (float)atof(cfg[3].sval);
-    ret->movetarget = atoi(cfg[4].sval);
+    ret->width = atoi(cfg[0].u.string.sval);
+    ret->height = atoi(cfg[1].u.string.sval);
+    ret->wrapping = cfg[2].u.boolean.bval;
+    ret->barrier_probability = (float)atof(cfg[3].u.string.sval);
+    ret->movetarget = atoi(cfg[4].u.string.sval);
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->width <= 1 || params->height <= 1)
         return "Width and height must both be greater than one";
@@ -701,7 +694,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return desc;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int w = params->width, h = params->height;
     int i;
@@ -891,7 +884,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     if (!aux) {
         *error = "Solution not known for this puzzle";
@@ -1084,7 +1077,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         }
 
         ui->cur_visible = 1;
-        return "";
+        return UI_UPDATE;
     }
 
     if (button == LEFT_BUTTON || button == RIGHT_BUTTON) {
@@ -1098,7 +1091,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         } else {
             /* 'click' when cursor is invisible just makes cursor visible. */
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
     } else
         return NULL;
diff --git a/apps/plugins/puzzles/src/nullfe.c b/apps/plugins/puzzles/src/nullfe.c
index ad381a135b..14b6e096c0 100644
--- a/apps/plugins/puzzles/src/nullfe.c
+++ b/apps/plugins/puzzles/src/nullfe.c
@@ -10,7 +10,7 @@
 
 void frontend_default_colour(frontend *fe, float *output) {}
 void draw_text(drawing *dr, int x, int y, int fonttype, int fontsize,
-               int align, int colour, char *text) {}
+               int align, int colour, const char *text) {}
 void draw_rect(drawing *dr, int x, int y, int w, int h, int colour) {}
 void draw_line(drawing *dr, int x1, int y1, int x2, int y2, int colour) {}
 void draw_thick_line(drawing *dr, float thickness,
@@ -41,15 +41,16 @@ int print_rgb_hatched_colour(drawing *dr, float r, float g, float b, int hatch)
 { return 0; }
 void print_line_width(drawing *dr, int width) {}
 void print_line_dotted(drawing *dr, int dotted) {}
-void midend_supersede_game_desc(midend *me, char *desc, char *privdesc) {}
-void status_bar(drawing *dr, char *text) {}
+void midend_supersede_game_desc(midend *me, const char *desc,
+                                const char *privdesc) {}
+void status_bar(drawing *dr, const char *text) {}
 struct preset_menu *preset_menu_new(void) {return NULL;}
 struct preset_menu *preset_menu_add_submenu(struct preset_menu *parent,
                                             char *title) {return NULL;}
 void preset_menu_add_preset(struct preset_menu *parent,
                             char *title, game_params *params) {}
 
-void fatal(char *fmt, ...)
+void fatal(const char *fmt, ...)
 {
     va_list ap;
 
@@ -64,7 +65,7 @@ void fatal(char *fmt, ...)
 }
 
 #ifdef DEBUGGING
-void debug_printf(char *fmt, ...)
+void debug_printf(const char *fmt, ...)
 {
     va_list ap;
     va_start(ap, fmt);
diff --git a/apps/plugins/puzzles/src/nullgame.c b/apps/plugins/puzzles/src/nullgame.c
index 183b1e39c2..bc19c1e6f0 100644
--- a/apps/plugins/puzzles/src/nullgame.c
+++ b/apps/plugins/puzzles/src/nullgame.c
@@ -78,7 +78,7 @@ static game_params *custom_params(const config_item *cfg)
     return NULL;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     return NULL;
 }
@@ -89,7 +89,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return dupstr("FIXME");
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     return NULL;
 }
@@ -119,7 +119,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     return NULL;
 }
diff --git a/apps/plugins/puzzles/src/osx.m b/apps/plugins/puzzles/src/osx.m
index be29819b62..daa4af1f09 100644
--- a/apps/plugins/puzzles/src/osx.m
+++ b/apps/plugins/puzzles/src/osx.m
@@ -111,7 +111,7 @@ NSApplication *app;
  * clearly defined subsystem.
  */
 
-void fatal(char *fmt, ...)
+void fatal(const char *fmt, ...)
 {
     va_list ap;
     char errorbuf[2048];
@@ -152,7 +152,7 @@ void get_random_seed(void **randseed, int *randseedsize)
     *randseedsize = sizeof(time_t);
 }
 
-static void savefile_write(void *wctx, void *buf, int len)
+static void savefile_write(void *wctx, const void *buf, int len)
 {
     FILE *fp = (FILE *)wctx;
     fwrite(buf, 1, len, fp);
@@ -275,7 +275,7 @@ id initnewitem(NSMenuItem *item, NSMenu *parent, const char *title,
     return item;
 }
 
-NSMenuItem *newitem(NSMenu *parent, char *title, char *key,
+NSMenuItem *newitem(NSMenu *parent, const char *title, const char *key,
                     id target, SEL action)
 {
     return initnewitem([NSMenuItem allocWithZone:[NSMenu menuZone]],
@@ -437,7 +437,7 @@ struct frontend {
 - (void)keyDown:(NSEvent *)ev;
 - (void)activateTimer;
 - (void)deactivateTimer;
-- (void)setStatusLine:(char *)text;
+- (void)setStatusLine:(const char *)text;
 - (void)resizeForNewGameParams;
 - (void)updateTypeMenuTick;
 @end
@@ -726,7 +726,7 @@ struct frontend {
     last_time = now;
 }
 
-- (void)showError:(char *)message
+- (void)showError:(const char *)message
 {
     NSAlert *alert;
 
@@ -789,7 +789,7 @@ struct frontend {
         const char *name = [[[op filenames] objectAtIndex:0]
                                cStringUsingEncoding:
                                    [NSString defaultCStringEncoding]];
-        char *err;
+        const char *err;
 
         FILE *fp = fopen(name, "r");
 
@@ -836,7 +836,7 @@ struct frontend {
 
 - (void)solveGame:(id)sender
 {
-    char *msg;
+    const char *msg;
 
     msg = midend_solve(me);
 
@@ -1103,7 +1103,8 @@ struct frontend {
             [tf setEditable:YES];
             [tf setSelectable:YES];
             [tf setBordered:YES];
-            [[tf cell] setTitle:[NSString stringWithUTF8String:i->sval]];
+            [[tf cell] setTitle:[NSString
+                                    stringWithUTF8String:i->u.string.sval]];
             [tf sizeToFit];
             rect = [tf frame];
             /*
@@ -1132,7 +1133,7 @@ struct frontend {
             [b setButtonType:NSSwitchButton];
             [b setTitle:[NSString stringWithUTF8String:i->name]];
             [b sizeToFit];
-            [b setState:(i->ival ? NSOnState : NSOffState)];
+            [b setState:(i->u.boolean.bval ? NSOnState : NSOffState)];
             rect = [b frame];
             if (totalw < rect.size.width + 1) totalw = rect.size.width + 1;
             if (thish < rect.size.height + 1) thish = rect.size.height + 1;
@@ -1161,12 +1162,14 @@ struct frontend {
             pb = [[NSPopUpButton alloc] initWithFrame:tmprect pullsDown:NO];
             [pb setBezelStyle:NSRoundedBezelStyle];
             {
-                char c, *p;
+                char c;
+                const char *p;
 
-                p = i->sval;
+                p = i->u.choices.choicenames;
                 c = *p++;
                 while (*p) {
-                    char *q, *copy;
+                    const char *q;
+                    char *copy;
 
                     q = p;
                     while (*p && *p != c) p++;
@@ -1180,7 +1183,7 @@ struct frontend {
                     if (*p) p++;
                 }
             }
-            [pb selectItemAtIndex:i->ival];
+            [pb selectItemAtIndex:i->u.choices.selected];
             [pb sizeToFit];
 
             rect = [pb frame];
@@ -1297,23 +1300,24 @@ struct frontend {
     if (update) {
         int k;
         config_item *i;
-        char *error;
+        const char *error;
 
         k = 0;
         for (i = cfg; i->type != C_END; i++) {
             switch (i->type) {
               case C_STRING:
-                sfree(i->sval);
-                i->sval = dupstr([[[(id)cfg_controls[k+1] cell]
+                sfree(i->u.string.sval);
+                i->u.string.sval = dupstr([[[(id)cfg_controls[k+1] cell]
                                   title] UTF8String]);
                 k += 2;
                 break;
               case C_BOOLEAN:
-                i->ival = [(id)cfg_controls[k] state] == NSOnState;
+                i->u.boolean.bval = [(id)cfg_controls[k] state] == NSOnState;
                 k++;
                 break;
               case C_CHOICES:
-                i->ival = [(id)cfg_controls[k+1] indexOfSelectedItem];
+                i->u.choices.selected =
+                    [(id)cfg_controls[k+1] indexOfSelectedItem];
                 k += 2;
                 break;
             }
@@ -1344,7 +1348,7 @@ struct frontend {
     [self sheetEndWithStatus:NO];
 }
 
-- (void)setStatusLine:(char *)text
+- (void)setStatusLine:(const char *)text
 {
     [[status cell] setTitle:[NSString stringWithUTF8String:text]];
 }
@@ -1457,7 +1461,8 @@ static void osx_draw_rect(void *handle, int x, int y, int w, int h, int colour)
     NSRectFill(r);
 }
 static void osx_draw_text(void *handle, int x, int y, int fonttype,
-                          int fontsize, int align, int colour, char *text)
+                          int fontsize, int align, int colour,
+                          const char *text)
 {
     frontend *fe = (frontend *)handle;
     NSString *string = [NSString stringWithUTF8String:text];
@@ -1608,7 +1613,7 @@ static void osx_end_draw(void *handle)
     frontend *fe = (frontend *)handle;
     [fe->image unlockFocus];
 }
-static void osx_status_bar(void *handle, char *text)
+static void osx_status_bar(void *handle, const char *text)
 {
     frontend *fe = (frontend *)handle;
     [fe->window setStatusLine:text];
diff --git a/apps/plugins/puzzles/src/palisade.c b/apps/plugins/puzzles/src/palisade.c
index b9d578d0f7..5227a1d56c 100644
--- a/apps/plugins/puzzles/src/palisade.c
+++ b/apps/plugins/puzzles/src/palisade.c
@@ -119,10 +119,20 @@ static config_item *game_configure(const game_params *params)
 {
     config_item *ret = snewn(4, config_item);
 
-    CONFIG(0, "Width",       C_STRING, 0, string(20, "%d", params->w));
-    CONFIG(1, "Height",      C_STRING, 0, string(20, "%d", params->h));
-    CONFIG(2, "Region size", C_STRING, 0, string(20, "%d", params->k));
-    CONFIG(3, NULL,          C_END,    0, NULL);
+    ret[0].name = "Width";
+    ret[0].type = C_STRING;
+    ret[0].u.string.sval = string(20, "%d", params->w);
+
+    ret[1].name = "Height";
+    ret[1].type = C_STRING;
+    ret[1].u.string.sval = string(20, "%d", params->h);
+
+    ret[2].name = "Region size";
+    ret[2].type = C_STRING;
+    ret[2].u.string.sval = string(20, "%d", params->k);
+
+    ret[3].name = NULL;
+    ret[3].type = C_END;
 
     return ret;
 }
@@ -131,9 +141,9 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *params = snew(game_params);
 
-    params->w = atoi(cfg[0].sval);
-    params->h = atoi(cfg[1].sval);
-    params->k = atoi(cfg[2].sval);
+    params->w = atoi(cfg[0].u.string.sval);
+    params->h = atoi(cfg[1].u.string.sval);
+    params->k = atoi(cfg[2].u.string.sval);
 
     return params;
 }
@@ -145,7 +155,7 @@ static game_params *custom_params(const config_item *cfg)
  * +---+   the dominos is horizontal or vertical.            +---+---+
  */
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     int w = params->w, h = params->h, k = params->k, wh = w * h;
 
@@ -691,7 +701,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return sresize(numbers, p - numbers, clue);
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
 
     int w = params->w, h = params->h, wh = w*h, squares = 0;
@@ -772,7 +782,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     int w = state->shared->params.w, h = state->shared->params.h, wh = w*h;
     borderflag *move;
@@ -986,7 +996,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                           ui->x, ui->y, flag, x, y, newflag);
         } else {
             move_cursor(button, &ui->x, &ui->y, w, h, FALSE);
-            return "";
+            return UI_UPDATE;
         }
     }
 
diff --git a/apps/plugins/puzzles/src/pattern.c b/apps/plugins/puzzles/src/pattern.c
index 270b558bda..e067f3ab0d 100644
--- a/apps/plugins/puzzles/src/pattern.c
+++ b/apps/plugins/puzzles/src/pattern.c
@@ -148,19 +148,15 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = NULL;
     ret[2].type = C_END;
-    ret[2].sval = NULL;
-    ret[2].ival = 0;
 
     return ret;
 }
@@ -169,13 +165,13 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w <= 0 || params->h <= 0)
         return "Width and height must both be greater than zero";
@@ -891,7 +887,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return desc;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int i, n, rowspace;
     const char *p;
@@ -1051,7 +1047,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *ai, char **error)
+                        const char *ai, const char **error)
 {
     unsigned char *matrix;
     int w = state->common->w, h = state->common->h;
@@ -1287,7 +1283,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         ui->drag_start_y = ui->drag_end_y = y;
         ui->cur_visible = 0;
 
-        return "";                     /* UI activity occurred */
+        return UI_UPDATE;
     }
 
     if (ui->dragging && button == ui->drag) {
@@ -1316,7 +1312,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         ui->drag_end_x = x;
         ui->drag_end_y = y;
 
-        return "";                     /* UI activity occurred */
+        return UI_UPDATE;
     }
 
     if (ui->dragging && button == ui->release) {
@@ -1344,7 +1340,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                     x1, y1, x2-x1+1, y2-y1+1);
             return dupstr(buf);
         } else
-            return "";                 /* UI activity occurred */
+            return UI_UPDATE;
     }
 
     if (IS_CURSOR_MOVE(button)) {
@@ -1352,12 +1348,12 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         char buf[80];
         move_cursor(button, &ui->cur_x, &ui->cur_y, state->common->w, state->common->h, 0);
         ui->cur_visible = 1;
-        if (!control && !shift) return "";
+        if (!control && !shift) return UI_UPDATE;
 
         newstate = control ? shift ? GRID_UNKNOWN : GRID_FULL : GRID_EMPTY;
         if (state->grid[y * state->common->w + x] == newstate &&
             state->grid[ui->cur_y * state->common->w + ui->cur_x] == newstate)
-            return "";
+            return UI_UPDATE;
 
         sprintf(buf, "%c%d,%d,%d,%d", control ? shift ? 'U' : 'F' : 'E',
                 min(x, ui->cur_x), min(y, ui->cur_y),
@@ -1372,7 +1368,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
 
         if (!ui->cur_visible) {
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
 
         if (button == CURSOR_SELECT2)
@@ -2027,7 +2023,8 @@ int main(int argc, char **argv)
 {
     game_params *p;
     game_state *s;
-    char *id = NULL, *desc, *err;
+    char *id = NULL, *desc;
+    const char *err;
 
     while (--argc > 0) {
         char *p = *++argv;
diff --git a/apps/plugins/puzzles/src/pearl.c b/apps/plugins/puzzles/src/pearl.c
index c6c305f3f2..4f3be50275 100644
--- a/apps/plugins/puzzles/src/pearl.c
+++ b/apps/plugins/puzzles/src/pearl.c
@@ -234,29 +234,24 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Difficulty";
     ret[2].type = C_CHOICES;
-    ret[2].sval = DIFFCONFIG;
-    ret[2].ival = params->difficulty;
+    ret[2].u.choices.choicenames = DIFFCONFIG;
+    ret[2].u.choices.selected = params->difficulty;
 
     ret[3].name = "Allow unsoluble";
     ret[3].type = C_BOOLEAN;
-    ret[3].sval = NULL;
-    ret[3].ival = params->nosolve;
+    ret[3].u.boolean.bval = params->nosolve;
 
     ret[4].name = NULL;
     ret[4].type = C_END;
-    ret[4].sval = NULL;
-    ret[4].ival = 0;
 
     return ret;
 }
@@ -265,15 +260,15 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->difficulty = cfg[2].ival;
-    ret->nosolve = cfg[3].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->difficulty = cfg[2].u.choices.selected;
+    ret->nosolve = cfg[3].u.boolean.bval;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 5) return "Width must be at least five";
     if (params->h < 5) return "Height must be at least five";
@@ -1392,7 +1387,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return desc;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int i, sizesofar;
     const int totalsize = params->w * params->h;
@@ -1726,7 +1721,7 @@ static char *solve_for_diff(game_state *state, char *old_lines, char *new_lines)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     game_state *solved = dup_game(state);
     int i, ret, sz = state->shared->sz;
@@ -2022,11 +2017,11 @@ static char *mark_in_direction(const game_state *state, int x, int y, int dir,
 
     char ch = primary ? 'F' : 'M', *other;
 
-    if (!INGRID(state, x, y) || !INGRID(state, x2, y2)) return "";
+    if (!INGRID(state, x, y) || !INGRID(state, x2, y2)) return UI_UPDATE;
 
     /* disallow laying a mark over a line, or vice versa. */
     other = primary ? state->marks : state->lines;
-    if (other[y*w+x] & dir || other[y2*w+x2] & dir2) return "";
+    if (other[y*w+x] & dir || other[y2*w+x2] & dir2) return UI_UPDATE;
     
     sprintf(buf, "%c%d,%d,%d;%c%d,%d,%d", ch, dir, x, y, ch, dir2, x2, y2);
     return dupstr(buf);
@@ -2060,12 +2055,12 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         ui->dragcoords[0] = gy * w + gx;
         ui->ndragcoords = 0;           /* will be 1 once drag is confirmed */
 
-        return "";
+        return UI_UPDATE;
     }
 
     if (button == LEFT_DRAG && ui->ndragcoords >= 0) {
         update_ui_drag(state, ui, gx, gy);
-        return "";
+        return UI_UPDATE;
     }
 
     if (IS_MOUSE_RELEASE(button)) release = TRUE;
@@ -2087,30 +2082,30 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             if (ui->ndragcoords >= 0)
                 update_ui_drag(state, ui, ui->curx, ui->cury);
         }
-        return "";
+        return UI_UPDATE;
     }
 
     if (IS_CURSOR_SELECT(button)) {
         if (!ui->cursor_active) {
             ui->cursor_active = TRUE;
-            return "";
+            return UI_UPDATE;
         } else if (button == CURSOR_SELECT) {
             if (ui->ndragcoords == -1) {
                 ui->ndragcoords = 0;
                 ui->dragcoords[0] = ui->cury * w + ui->curx;
                 ui->clickx = CENTERED_COORD(ui->curx);
                 ui->clicky = CENTERED_COORD(ui->cury);
-                return "";
+                return UI_UPDATE;
             } else release = TRUE;
         } else if (button == CURSOR_SELECT2 && ui->ndragcoords >= 0) {
             ui->ndragcoords = -1;
-            return "";
+            return UI_UPDATE;
         }
     }
 
     if (button == 27 || button == '\b') {
         ui->ndragcoords = -1;
-        return "";
+        return UI_UPDATE;
     }
 
     if (release) {
@@ -2142,7 +2137,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
 
             ui->ndragcoords = -1;
 
-            return buf ? buf : "";
+            return buf ? buf : UI_UPDATE;
         } else if (ui->ndragcoords == 0) {
             /* Click (or tiny drag). Work out which edge we were
              * closest to. */
@@ -2163,12 +2158,12 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             cx = CENTERED_COORD(gx);
             cy = CENTERED_COORD(gy);
 
-            if (!INGRID(state, gx, gy)) return "";
+            if (!INGRID(state, gx, gy)) return UI_UPDATE;
 
             if (max(abs(x-cx),abs(y-cy)) < TILE_SIZE/4) {
                 /* TODO closer to centre of grid: process as a cell click not an edge click. */
 
-                return "";
+                return UI_UPDATE;
             } else {
                 int direction;
                 if (abs(x-cx) < abs(y-cy)) {
@@ -2712,7 +2707,8 @@ int main(int argc, const char *argv[])
     game_params *p = NULL;
     random_state *rs = NULL;
     time_t seed = time(NULL);
-    char *id = NULL, *err;
+    char *id = NULL;
+    const char *err;
 
     setvbuf(stdout, NULL, _IONBF, 0);
 
diff --git a/apps/plugins/puzzles/src/pegs.c b/apps/plugins/puzzles/src/pegs.c
index 8286851954..565ba9417f 100644
--- a/apps/plugins/puzzles/src/pegs.c
+++ b/apps/plugins/puzzles/src/pegs.c
@@ -149,24 +149,20 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Board type";
     ret[2].type = C_CHOICES;
-    ret[2].sval = TYPECONFIG;
-    ret[2].ival = params->type;
+    ret[2].u.choices.choicenames = TYPECONFIG;
+    ret[2].u.choices.selected = params->type;
 
     ret[3].name = NULL;
     ret[3].type = C_END;
-    ret[3].sval = NULL;
-    ret[3].ival = 0;
 
     return ret;
 }
@@ -175,14 +171,14 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->type = cfg[2].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->type = cfg[2].u.choices.selected;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (full && (params->w <= 3 || params->h <= 3))
         return "Width and height must both be greater than three";
@@ -660,7 +656,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int len = params->w * params->h;
 
@@ -711,7 +707,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     return NULL;
 }
@@ -848,7 +844,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             ui->dx = x;
             ui->dy = y;
             ui->cur_visible = ui->cur_jumping = 0;
-            return "";                 /* ui modified */
+            return UI_UPDATE;
         }
     } else if (button == LEFT_DRAG && ui->dragging) {
         /*
@@ -856,7 +852,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
          */
         ui->dx = x;
         ui->dy = y;
-        return "";                     /* ui modified */
+        return UI_UPDATE;
     } else if (button == LEFT_RELEASE && ui->dragging) {
         int tx, ty, dx, dy;
 
@@ -868,18 +864,18 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         tx = FROMCOORD(x);
         ty = FROMCOORD(y);
         if (tx < 0 || tx >= w || ty < 0 || ty >= h)
-            return "";                 /* target out of range */
+            return UI_UPDATE;          /* target out of range */
         dx = tx - ui->sx;
         dy = ty - ui->sy;
         if (max(abs(dx),abs(dy)) != 2 || min(abs(dx),abs(dy)) != 0)
-            return "";                 /* move length was wrong */
+            return UI_UPDATE;          /* move length was wrong */
         dx /= 2;
         dy /= 2;
 
         if (state->grid[ty*w+tx] != GRID_HOLE ||
             state->grid[(ty-dy)*w+(tx-dx)] != GRID_PEG ||
             state->grid[ui->sy*w+ui->sx] != GRID_PEG)
-            return "";                 /* grid contents were invalid */
+            return UI_UPDATE;          /* grid contents were invalid */
 
         /*
          * We have a valid move. Encode it simply as source and
@@ -899,7 +895,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                 ui->cur_x = cx;
                 ui->cur_y = cy;
             }
-            return "";
+            return UI_UPDATE;
         } else {
             int dx, dy, mx, my, jx, jy;
 
@@ -922,21 +918,21 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                 ui->cur_x = jx; ui->cur_y = jy;
                 return dupstr(buf);
             }
-            return "";
+            return UI_UPDATE;
         }
     } else if (IS_CURSOR_SELECT(button)) {
         if (!ui->cur_visible) {
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
         if (ui->cur_jumping) {
             ui->cur_jumping = 0;
-            return "";
+            return UI_UPDATE;
         }
         if (state->grid[ui->cur_y*w+ui->cur_x] == GRID_PEG) {
             /* cursor is on peg: next arrow-move wil jump. */
             ui->cur_jumping = 1;
-            return "";
+            return UI_UPDATE;
         }
         return NULL;
     }
diff --git a/apps/plugins/puzzles/src/ps.c b/apps/plugins/puzzles/src/ps.c
index 2394cc5e8e..ac021aa80a 100644
--- a/apps/plugins/puzzles/src/ps.c
+++ b/apps/plugins/puzzles/src/ps.c
@@ -21,7 +21,7 @@ struct psdata {
     drawing *drawing;
 };
 
-static void ps_printf(psdata *ps, char *fmt, ...)
+static void ps_printf(psdata *ps, const char *fmt, ...)
 {
     va_list ap;
 
@@ -73,7 +73,7 @@ static void ps_fill(psdata *ps, int colour)
     }
 }
 
-static void ps_setcolour_internal(psdata *ps, int colour, char *suffix)
+static void ps_setcolour_internal(psdata *ps, int colour, const char *suffix)
 {
     int hatch;
     float r, g, b;
@@ -102,7 +102,8 @@ static void ps_stroke(psdata *ps, int colour)
 }
 
 static void ps_draw_text(void *handle, int x, int y, int fonttype,
-                         int fontsize, int align, int colour, char *text)
+                         int fontsize, int align, int colour,
+                         const char *text)
 {
     psdata *ps = (psdata *)handle;
 
diff --git a/apps/plugins/puzzles/src/puzzles.h b/apps/plugins/puzzles/src/puzzles.h
index 73b31ea7f9..47f4b7edd5 100644
--- a/apps/plugins/puzzles/src/puzzles.h
+++ b/apps/plugins/puzzles/src/puzzles.h
@@ -137,30 +137,36 @@ typedef struct psdata psdata;
  */
 enum { C_STRING, C_CHOICES, C_BOOLEAN, C_END };
 struct config_item {
-    /*
-     * `name' is never dynamically allocated.
-     */
-    char *name;
-    /*
-     * `type' contains one of the above values.
-     */
+    /* Not dynamically allocated */
+    const char *name;
+    /* Value from the above C_* enum */
     int type;
-    /*
-     * For C_STRING, `sval' is always dynamically allocated and
-     * non-NULL. For C_BOOLEAN and C_END, `sval' is always NULL.
-     * For C_CHOICES, `sval' is non-NULL, _not_ dynamically
-     * allocated, and contains a set of option strings separated by
-     * a delimiter. The delimeter is also the first character in
-     * the string, so for example ":Foo:Bar:Baz" gives three
-     * options `Foo', `Bar' and `Baz'.
-     */
-    char *sval;
-    /*
-     * For C_BOOLEAN, this is TRUE or FALSE. For C_CHOICES, it
-     * indicates the chosen index from the `sval' list. In the
-     * above example, 0==Foo, 1==Bar and 2==Baz.
-     */
-    int ival;
+    union {
+        struct { /* if type == C_STRING */
+            /* Always dynamically allocated and non-NULL */
+            char *sval;
+        } string;
+        struct { /* if type == C_CHOICES */
+            /*
+             * choicenames is non-NULL, not dynamically allocated, and
+             * contains a set of option strings separated by a
+             * delimiter. The delimiter is also the first character in
+             * the string, so for example ":Foo:Bar:Baz" gives three
+             * options `Foo', `Bar' and `Baz'.
+             */
+            const char *choicenames;
+            /*
+             * Indicates the chosen index from the options in
+             * choicenames. In the above example, 0==Foo, 1==Bar and
+             * 2==Baz.
+             */
+            int selected;
+        } choices;
+        struct {
+            /* just TRUE or FALSE */
+            int bval;
+        } boolean;
+    } u;
 };
 
 /*
@@ -218,12 +224,12 @@ game_params *preset_menu_lookup_by_id(struct preset_menu *menu, int id);
 /* We can't use #ifdef DEBUG, because Cygwin defines it by default. */
 #ifdef DEBUGGING
 #define debug(x) (debug_printf x)
-void debug_printf(char *fmt, ...);
+void debug_printf(const char *fmt, ...);
 #else
 #define debug(x)
 #endif
 
-void fatal(char *fmt, ...);
+void fatal(const char *fmt, ...);
 void frontend_default_colour(frontend *fe, float *output);
 void deactivate_timer(frontend *fe);
 void activate_timer(frontend *fe);
@@ -235,7 +241,7 @@ void get_random_seed(void **randseed, int *randseedsize);
 drawing *drawing_new(const drawing_api *api, midend *me, void *handle);
 void drawing_free(drawing *dr);
 void draw_text(drawing *dr, int x, int y, int fonttype, int fontsize,
-               int align, int colour, char *text);
+               int align, int colour, const char *text);
 void draw_rect(drawing *dr, int x, int y, int w, int h, int colour);
 void draw_line(drawing *dr, int x1, int y1, int x2, int y2, int colour);
 void draw_polygon(drawing *dr, int *coords, int npoints,
@@ -250,7 +256,7 @@ void start_draw(drawing *dr);
 void draw_update(drawing *dr, int x, int y, int w, int h);
 void end_draw(drawing *dr);
 char *text_fallback(drawing *dr, const char *const *strings, int nstrings);
-void status_bar(drawing *dr, char *text);
+void status_bar(drawing *dr, const char *text);
 blitter *blitter_new(drawing *dr, int w, int h);
 void blitter_free(drawing *dr, blitter *bl);
 /* save puts the portion of the current display with top-left corner
@@ -305,29 +311,31 @@ int midend_which_preset(midend *me);
 int midend_wants_statusbar(midend *me);
 enum { CFG_SETTINGS, CFG_SEED, CFG_DESC, CFG_FRONTEND_SPECIFIC };
 config_item *midend_get_config(midend *me, int which, char **wintitle);
-char *midend_set_config(midend *me, int which, config_item *cfg);
-char *midend_game_id(midend *me, char *id);
+const char *midend_set_config(midend *me, int which, config_item *cfg);
+const char *midend_game_id(midend *me, const char *id);
 char *midend_get_game_id(midend *me);
 char *midend_get_random_seed(midend *me);
 int midend_can_format_as_text_now(midend *me);
 char *midend_text_format(midend *me);
-char *midend_solve(midend *me);
+const char *midend_solve(midend *me);
 int midend_status(midend *me);
 int midend_can_undo(midend *me);
 int midend_can_redo(midend *me);
-void midend_supersede_game_desc(midend *me, char *desc, char *privdesc);
-char *midend_rewrite_statusbar(midend *me, char *text);
+void midend_supersede_game_desc(midend *me, const char *desc,
+                                const char *privdesc);
+char *midend_rewrite_statusbar(midend *me, const char *text);
 void midend_serialise(midend *me,
-                      void (*write)(void *ctx, void *buf, int len),
+                      void (*write)(void *ctx, const void *buf, int len),
                       void *wctx);
-char *midend_deserialise(midend *me,
-                         int (*read)(void *ctx, void *buf, int len),
-                         void *rctx);
-char *identify_game(char **name, int (*read)(void *ctx, void *buf, int len),
-                    void *rctx);
+const char *midend_deserialise(midend *me,
+                               int (*read)(void *ctx, void *buf, int len),
+                               void *rctx);
+const char *identify_game(char **name,
+                          int (*read)(void *ctx, void *buf, int len),
+                          void *rctx);
 void midend_request_id_changes(midend *me, void (*notify)(void *), void *ctx);
 /* Printing functions supplied by the mid-end */
-char *midend_print_puzzle(midend *me, document *doc, int with_soln);
+const char *midend_print_puzzle(midend *me, document *doc, int with_soln);
 int midend_tilesize(midend *me);
 
 /*
@@ -385,7 +393,7 @@ void pos2c(int w, int h, int pos, int *cx, int *cy);
  * by one pixel; useful for highlighting. Outline is omitted if -1. */
 void draw_text_outline(drawing *dr, int x, int y, int fonttype,
                        int fontsize, int align,
-                       int text_colour, int outline_colour, char *text);
+                       int text_colour, int outline_colour, const char *text);
 
 /* Copies text left-justified with spaces. Length of string must be
  * less than buffer size. */
@@ -587,17 +595,17 @@ struct game {
     int can_configure;
     config_item *(*configure)(const game_params *params);
     game_params *(*custom_params)(const config_item *cfg);
-    char *(*validate_params)(const game_params *params, int full);
+    const char *(*validate_params)(const game_params *params, int full);
     char *(*new_desc)(const game_params *params, random_state *rs,
                       char **aux, int interactive);
-    char *(*validate_desc)(const game_params *params, const char *desc);
+    const char *(*validate_desc)(const game_params *params, const char *desc);
     game_state *(*new_game)(midend *me, const game_params *params,
                             const char *desc);
     game_state *(*dup_game)(const game_state *state);
     void (*free_game)(game_state *state);
     int can_solve;
     char *(*solve)(const game_state *orig, const game_state *curr,
-                   const char *aux, char **error);
+                   const char *aux, const char **error);
     int can_format_as_text_ever;
     int (*can_format_as_text_now)(const game_params *params);
     char *(*text_format)(const game_state *state);
@@ -642,7 +650,7 @@ struct game {
  */
 struct drawing_api {
     void (*draw_text)(void *handle, int x, int y, int fonttype, int fontsize,
-                      int align, int colour, char *text);
+                      int align, int colour, const char *text);
     void (*draw_rect)(void *handle, int x, int y, int w, int h, int colour);
     void (*draw_line)(void *handle, int x1, int y1, int x2, int y2,
                       int colour);
@@ -655,7 +663,7 @@ struct drawing_api {
     void (*unclip)(void *handle);
     void (*start_draw)(void *handle);
     void (*end_draw)(void *handle);
-    void (*status_bar)(void *handle, char *text);
+    void (*status_bar)(void *handle, const char *text);
     blitter *(*blitter_new)(void *handle, int w, int h);
     void (*blitter_free)(void *handle, blitter *bl);
     void (*blitter_save)(void *handle, blitter *bl, int x, int y);
@@ -688,6 +696,14 @@ extern const int gamecount;
 extern const game thegame;
 #endif
 
+/*
+ * Special string value to return from interpret_move in the case
+ * where the game UI has been updated but no actual move is being
+ * appended to the undo chain. Must be declared as a non-const char,
+ * but should never actually be modified by anyone.
+ */
+extern char UI_UPDATE[];
+
 /* A little bit of help to lazy developers */
 #define DEFAULT_STATUSBAR_TEXT "Use status_bar() to fill this in."
 
diff --git a/apps/plugins/puzzles/src/range.c b/apps/plugins/puzzles/src/range.c
index 4dd39b97cd..41c6a352d3 100644
--- a/apps/plugins/puzzles/src/range.c
+++ b/apps/plugins/puzzles/src/range.c
@@ -66,7 +66,7 @@
 
 #define setmember(obj, field) ( (obj) . field = field )
 
-static char *nfmtstr(int n, char *fmt, ...) {
+static char *nfmtstr(int n, const char *fmt, ...) {
     va_list va;
     char *ret = snewn(n+1, char);
     va_start(va, fmt);
@@ -170,18 +170,14 @@ static config_item *game_configure(const game_params *params)
 
     ret[0].name = "Width";
     ret[0].type = C_STRING;
-    ret[0].sval = nfmtstr(10, "%d", params->w);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = nfmtstr(10, "%d", params->w);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
-    ret[1].sval = nfmtstr(10, "%d", params->h);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = nfmtstr(10, "%d", params->h);
 
     ret[2].name = NULL;
     ret[2].type = C_END;
-    ret[2].sval = NULL;
-    ret[2].ival = 0;
 
     return ret;
 }
@@ -189,8 +185,8 @@ static config_item *game_configure(const game_params *params)
 static game_params *custom_params(const config_item *configuration)
 {
     game_params *ret = snew(game_params);
-    ret->w = atoi(configuration[0].sval);
-    ret->h = atoi(configuration[1].sval);
+    ret->w = atoi(configuration[0].u.string.sval);
+    ret->h = atoi(configuration[1].u.string.sval);
     return ret;
 }
 
@@ -312,7 +308,7 @@ enum {
 static move *solve_internal(const game_state *state, move *base, int diff);
 
 static char *solve_game(const game_state *orig, const game_state *curpos,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     int const n = orig->params.w * orig->params.h;
     move *const base = snewn(n, move);
@@ -910,7 +906,7 @@ static int dfs_count_white(game_state *state, int cell)
     return k;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     int const w = params->w, h = params->h;
     if (w < 1) return "Error: width is less than 1";
@@ -1077,7 +1073,7 @@ static char *newdesc_encode_game_description(int area, puzzle_size *grid)
     return desc;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int const n = params->w * params->h;
     int squares = 0;
@@ -1360,14 +1356,14 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                 else if (do_post)
                     return nfmtstr(40, "W,%d,%d", ui->r, ui->c);
                 else
-                    return "";
+                    return UI_UPDATE;
 
             } else if (!out_of_bounds(ui->r + dr[i], ui->c + dc[i], w, h)) {
                 ui->r += dr[i];
                 ui->c += dc[i];
             }
         } else ui->cursor_show = TRUE;
-        return "";
+        return UI_UPDATE;
     }
 
     if (action == hint) {
diff --git a/apps/plugins/puzzles/src/rect.c b/apps/plugins/puzzles/src/rect.c
index 247138cedb..c9923ad196 100644
--- a/apps/plugins/puzzles/src/rect.c
+++ b/apps/plugins/puzzles/src/rect.c
@@ -183,30 +183,24 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Expansion factor";
     ret[2].type = C_STRING;
     ftoa(buf, params->expandfactor);
-    ret[2].sval = dupstr(buf);
-    ret[2].ival = 0;
+    ret[2].u.string.sval = dupstr(buf);
 
     ret[3].name = "Ensure unique solution";
     ret[3].type = C_BOOLEAN;
-    ret[3].sval = NULL;
-    ret[3].ival = params->unique;
+    ret[3].u.boolean.bval = params->unique;
 
     ret[4].name = NULL;
     ret[4].type = C_END;
-    ret[4].sval = NULL;
-    ret[4].ival = 0;
 
     return ret;
 }
@@ -215,15 +209,15 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->expandfactor = (float)atof(cfg[2].sval);
-    ret->unique = cfg[3].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->expandfactor = (float)atof(cfg[2].u.string.sval);
+    ret->unique = cfg[3].u.boolean.bval;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w <= 0 || params->h <= 0)
         return "Width and height must both be greater than zero";
@@ -1782,7 +1776,7 @@ static char *new_game_desc(const game_params *params_in, random_state *rs,
     return desc;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int area = params->w * params->h;
     int squares = 0;
@@ -1983,7 +1977,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *ai, char **error)
+                        const char *ai, const char **error)
 {
     unsigned char *vedge, *hedge;
     int x, y, len;
@@ -2410,7 +2404,7 @@ static char *interpret_move(const game_state *from, game_ui *ui,
         move_cursor(button, &ui->cur_x, &ui->cur_y, from->w, from->h, 0);
         ui->cur_visible = TRUE;
         active = TRUE;
-        if (!ui->cur_dragging) return "";
+        if (!ui->cur_dragging) return UI_UPDATE;
         coord_round((float)ui->cur_x + 0.5F, (float)ui->cur_y + 0.5F, &xc, &yc);
     } else if (IS_CURSOR_SELECT(button)) {
         if (ui->drag_start_x >= 0 && !ui->cur_dragging) {
@@ -2423,7 +2417,7 @@ static char *interpret_move(const game_state *from, game_ui *ui,
         if (!ui->cur_visible) {
             assert(!ui->cur_dragging);
             ui->cur_visible = TRUE;
-            return "";
+            return UI_UPDATE;
         }
         coord_round((float)ui->cur_x + 0.5F, (float)ui->cur_y + 0.5F, &xc, &yc);
         erasing = (button == CURSOR_SELECT2);
@@ -2444,7 +2438,7 @@ static char *interpret_move(const game_state *from, game_ui *ui,
             reset_ui(ui); /* cancel keyboard dragging */
             ui->cur_dragging = FALSE;
         }
-        return "";
+        return UI_UPDATE;
     } else if (button != LEFT_DRAG && button != RIGHT_DRAG) {
         return NULL;
     }
@@ -2528,7 +2522,7 @@ static char *interpret_move(const game_state *from, game_ui *ui,
     if (ret)
         return ret;                    /* a move has been made */
     else if (active)
-        return "";                     /* UI activity has occurred */
+        return UI_UPDATE;
     else
         return NULL;
 }
diff --git a/apps/plugins/puzzles/src/samegame.c b/apps/plugins/puzzles/src/samegame.c
index 88edad32b1..d7d06764bf 100644
--- a/apps/plugins/puzzles/src/samegame.c
+++ b/apps/plugins/puzzles/src/samegame.c
@@ -241,35 +241,29 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "No. of colours";
     ret[2].type = C_STRING;
     sprintf(buf, "%d", params->ncols);
-    ret[2].sval = dupstr(buf);
-    ret[2].ival = 0;
+    ret[2].u.string.sval = dupstr(buf);
 
     ret[3].name = "Scoring system";
     ret[3].type = C_CHOICES;
-    ret[3].sval = ":(n-1)^2:(n-2)^2";
-    ret[3].ival = params->scoresub-1;
+    ret[3].u.choices.choicenames = ":(n-1)^2:(n-2)^2";
+    ret[3].u.choices.selected = params->scoresub-1;
 
     ret[4].name = "Ensure solubility";
     ret[4].type = C_BOOLEAN;
-    ret[4].sval = NULL;
-    ret[4].ival = params->soluble;
+    ret[4].u.boolean.bval = params->soluble;
 
     ret[5].name = NULL;
     ret[5].type = C_END;
-    ret[5].sval = NULL;
-    ret[5].ival = 0;
 
     return ret;
 }
@@ -278,16 +272,16 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->ncols = atoi(cfg[2].sval);
-    ret->scoresub = cfg[3].ival + 1;
-    ret->soluble = cfg[4].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->ncols = atoi(cfg[2].u.string.sval);
+    ret->scoresub = cfg[3].u.choices.selected + 1;
+    ret->soluble = cfg[4].u.boolean.bval;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 1 || params->h < 1)
         return "Width and height must both be positive";
@@ -948,7 +942,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int area = params->w * params->h, i;
     const char *p = desc;
@@ -1018,7 +1012,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     return NULL;
 }
@@ -1114,7 +1108,8 @@ static void game_changed_state(game_ui *ui, const game_state *oldstate,
 static char *sel_movedesc(game_ui *ui, const game_state *state)
 {
     int i;
-    char *ret, *sep, buf[80];
+    char *ret, buf[80];
+    const char *sep;
     int retlen, retsize;
 
     retsize = 256;
@@ -1273,7 +1268,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                             int x, int y, int button)
 {
     int tx, ty;
-    char *ret = "";
+    char *ret = UI_UPDATE;
 
     ui->displaysel = 0;
 
diff --git a/apps/plugins/puzzles/src/signpost.c b/apps/plugins/puzzles/src/signpost.c
index a61ec8b536..edcf63a823 100644
--- a/apps/plugins/puzzles/src/signpost.c
+++ b/apps/plugins/puzzles/src/signpost.c
@@ -387,24 +387,19 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Start and end in corners";
     ret[2].type = C_BOOLEAN;
-    ret[2].sval = NULL;
-    ret[2].ival = params->force_corner_start;
+    ret[2].u.boolean.bval = params->force_corner_start;
 
     ret[3].name = NULL;
     ret[3].type = C_END;
-    ret[3].sval = NULL;
-    ret[3].ival = 0;
 
     return ret;
 }
@@ -413,14 +408,14 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->force_corner_start = cfg[2].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->force_corner_start = cfg[2].u.boolean.bval;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 1) return "Width must be at least one";
     if (params->h < 1) return "Height must be at least one";
@@ -502,10 +497,11 @@ static void free_game(game_state *state)
 }
 
 static void unpick_desc(const game_params *params, const char *desc,
-                        game_state **sout, char **mout)
+                        game_state **sout, const char **mout)
 {
     game_state *state = blank_game(params->w, params->h);
-    char *msg = NULL, c;
+    const char *msg = NULL;
+    char c;
     int num = 0, i = 0;
 
     while (*desc) {
@@ -848,9 +844,9 @@ generate:
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
-    char *ret = NULL;
+    const char *ret = NULL;
 
     unpick_desc(params, desc, NULL, &ret);
     return ret;
@@ -1342,7 +1338,7 @@ static int solve_state(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     game_state *tosolve;
     char *ret = NULL;
@@ -1441,18 +1437,20 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             ui->dx = COORD(ui->cx) + TILE_SIZE/2;
             ui->dy = COORD(ui->cy) + TILE_SIZE/2;
         }
-        return "";
+        return UI_UPDATE;
     } else if (IS_CURSOR_SELECT(button)) {
         if (!ui->cshow)
             ui->cshow = 1;
         else if (ui->dragging) {
             ui->dragging = FALSE;
-            if (ui->sx == ui->cx && ui->sy == ui->cy) return "";
+            if (ui->sx == ui->cx && ui->sy == ui->cy) return UI_UPDATE;
             if (ui->drag_is_from) {
-                if (!isvalidmove(state, 0, ui->sx, ui->sy, ui->cx, ui->cy)) return "";
+                if (!isvalidmove(state, 0, ui->sx, ui->sy, ui->cx, ui->cy))
+                    return UI_UPDATE;
                 sprintf(buf, "L%d,%d-%d,%d", ui->sx, ui->sy, ui->cx, ui->cy);
             } else {
-                if (!isvalidmove(state, 0, ui->cx, ui->cy, ui->sx, ui->sy)) return "";
+                if (!isvalidmove(state, 0, ui->cx, ui->cy, ui->sx, ui->sy))
+                    return UI_UPDATE;
                 sprintf(buf, "L%d,%d-%d,%d", ui->cx, ui->cy, ui->sx, ui->sy);
             }
             return dupstr(buf);
@@ -1464,7 +1462,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             ui->dy = COORD(ui->cy) + TILE_SIZE/2;
             ui->drag_is_from = (button == CURSOR_SELECT) ? 1 : 0;
         }
-        return "";
+        return UI_UPDATE;
     }
     if (IS_MOUSE_DOWN(button)) {
         if (ui->cshow) {
@@ -1492,29 +1490,31 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         ui->dx = mx;
         ui->dy = my;
         ui->cshow = 0;
-        return "";
+        return UI_UPDATE;
     } else if (IS_MOUSE_DRAG(button) && ui->dragging) {
         ui->dx = mx;
         ui->dy = my;
-        return "";
+        return UI_UPDATE;
     } else if (IS_MOUSE_RELEASE(button) && ui->dragging) {
         ui->dragging = FALSE;
-        if (ui->sx == x && ui->sy == y) return ""; /* single click */
+        if (ui->sx == x && ui->sy == y) return UI_UPDATE; /* single click */
 
         if (!INGRID(state, x, y)) {
             int si = ui->sy*w+ui->sx;
             if (state->prev[si] == -1 && state->next[si] == -1)
-                return "";
+                return UI_UPDATE;
             sprintf(buf, "%c%d,%d",
                     (int)(ui->drag_is_from ? 'C' : 'X'), ui->sx, ui->sy);
             return dupstr(buf);
         }
 
         if (ui->drag_is_from) {
-            if (!isvalidmove(state, 0, ui->sx, ui->sy, x, y)) return "";
+            if (!isvalidmove(state, 0, ui->sx, ui->sy, x, y))
+                return UI_UPDATE;
             sprintf(buf, "L%d,%d-%d,%d", ui->sx, ui->sy, x, y);
         } else {
-            if (!isvalidmove(state, 0, x, y, ui->sx, ui->sy)) return "";
+            if (!isvalidmove(state, 0, x, y, ui->sx, ui->sy))
+                return UI_UPDATE;
             sprintf(buf, "L%d,%d-%d,%d", x, y, ui->sx, ui->sy);
         }
         return dupstr(buf);
@@ -1523,7 +1523,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
     else if ((button == 'x' || button == 'X') && ui->cshow) {
         int si = ui->cy*w + ui->cx;
         if (state->prev[si] == -1 && state->next[si] == -1)
-            return "";
+            return UI_UPDATE;
         sprintf(buf, "%c%d,%d",
                 (int)((button == 'x') ? 'C' : 'X'), ui->cx, ui->cy);
         return dupstr(buf);
@@ -1560,7 +1560,7 @@ static game_state *execute_move(const game_state *state, const char *move)
     if (move[0] == 'S') {
         game_params p;
         game_state *tmp;
-        char *valid;
+        const char *valid;
         int i;
 
         p.w = state->w; p.h = state->h;
@@ -2330,7 +2330,8 @@ static void start_soak(game_params *p, char *seedstr)
 
 static void process_desc(char *id)
 {
-    char *desc, *err, *solvestr;
+    char *desc, *solvestr;
+    const char *err;
     game_params *p;
     game_state *s;
 
@@ -2374,7 +2375,8 @@ static void process_desc(char *id)
 
 int main(int argc, const char *argv[])
 {
-    char *id = NULL, *desc, *err, *aux = NULL;
+    char *id = NULL, *desc, *aux = NULL;
+    const char *err;
     int soak = 0, verbose = 0, stdin_desc = 0, n = 1, i;
     char *seedstr = NULL, newseed[16];
 
diff --git a/apps/plugins/puzzles/src/singles.c b/apps/plugins/puzzles/src/singles.c
index 5fe054c663..5929d82932 100644
--- a/apps/plugins/puzzles/src/singles.c
+++ b/apps/plugins/puzzles/src/singles.c
@@ -222,24 +222,20 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Difficulty";
     ret[2].type = C_CHOICES;
-    ret[2].sval = DIFFCONFIG;
-    ret[2].ival = params->diff;
+    ret[2].u.choices.choicenames = DIFFCONFIG;
+    ret[2].u.choices.selected = params->diff;
 
     ret[3].name = NULL;
     ret[3].type = C_END;
-    ret[3].sval = NULL;
-    ret[3].ival = 0;
 
     return ret;
 }
@@ -248,14 +244,14 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->diff = cfg[2].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->diff = cfg[2].u.choices.selected;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 2 || params->h < 2)
         return "Width and neight must be at least two";
@@ -334,10 +330,10 @@ static int c2n(char c) {
 }
 
 static void unpick_desc(const game_params *params, const char *desc,
-                        game_state **sout, char **mout)
+                        game_state **sout, const char **mout)
 {
     game_state *state = blank_game(params->w, params->h);
-    char *msg = NULL;
+    const char *msg = NULL;
     int num = 0, i = 0;
 
     if (strlen(desc) != state->n) {
@@ -1185,7 +1181,7 @@ static int solve_specific(game_state *state, int diff, int sneaky)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     game_state *solved = dup_game(currstate);
     char *move = NULL;
@@ -1414,9 +1410,9 @@ randomise:
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
-    char *ret = NULL;
+    const char *ret = NULL;
 
     unpick_desc(params, desc, NULL, &ret);
     return ret;
@@ -1522,7 +1518,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             action = TOGGLE_CIRCLE;
         }
     }
-    if (action == UI) return "";
+    if (action == UI) return UI_UPDATE;
 
     if (action == TOGGLE_BLACK || action == TOGGLE_CIRCLE) {
         i = y * state->w + x;
@@ -1910,7 +1906,8 @@ static void start_soak(game_params *p, random_state *rs)
 
 int main(int argc, char **argv)
 {
-    char *id = NULL, *desc, *desc_gen = NULL, *tgame, *err, *aux;
+    char *id = NULL, *desc, *desc_gen = NULL, *tgame, *aux;
+    const char *err;
     game_state *s = NULL;
     game_params *p = NULL;
     int soln, soak = 0, ret = 1;
diff --git a/apps/plugins/puzzles/src/sixteen.c b/apps/plugins/puzzles/src/sixteen.c
index aaf524a0d6..9fa7032f02 100644
--- a/apps/plugins/puzzles/src/sixteen.c
+++ b/apps/plugins/puzzles/src/sixteen.c
@@ -140,25 +140,20 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Number of shuffling moves";
     ret[2].type = C_STRING;
     sprintf(buf, "%d", params->movetarget);
-    ret[2].sval = dupstr(buf);
-    ret[2].ival = 0;
+    ret[2].u.string.sval = dupstr(buf);
 
     ret[3].name = NULL;
     ret[3].type = C_END;
-    ret[3].sval = NULL;
-    ret[3].ival = 0;
 
     return ret;
 }
@@ -167,14 +162,14 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->movetarget = atoi(cfg[2].sval);
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->movetarget = atoi(cfg[2].u.string.sval);
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 2 || params->h < 2)
         return "Width and height must both be at least two";
@@ -402,10 +397,9 @@ static char *new_game_desc(const game_params *params, random_state *rs,
 }
 
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
-    const char *p;
-    char *err;
+    const char *p, *err;
     int i, area;
     int *used;
 
@@ -510,7 +504,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     return dupstr("S");
 }
@@ -619,7 +613,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
     if (IS_CURSOR_MOVE(button) || pad) {
         if (!ui->cur_visible) {
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
 
         if (control || shift || ui->cur_mode) {
@@ -674,7 +668,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             }
 
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
     }
 
@@ -692,11 +686,11 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                 const enum cursor_mode m = (button == CURSOR_SELECT2 ?
                                             lock_position : lock_tile);
                 ui->cur_mode = (ui->cur_mode == m ? unlocked : m);
-                return "";
+                return UI_UPDATE;
             }
         } else {
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
     } else {
         return NULL;
@@ -711,7 +705,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
     else if (cy == state->h && cx >= 0 && cx < state->w)
         dy = +1, dx = 0;
     else
-        return "";                   /* invalid click location */
+        return UI_UPDATE;            /* invalid click location */
 
     /* reverse direction if right hand button is pressed */
     if (button == RIGHT_BUTTON || button == CURSOR_SELECT2) {
diff --git a/apps/plugins/puzzles/src/slant.c b/apps/plugins/puzzles/src/slant.c
index 5f9f4f6fed..3fd66115b1 100644
--- a/apps/plugins/puzzles/src/slant.c
+++ b/apps/plugins/puzzles/src/slant.c
@@ -184,24 +184,20 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Difficulty";
     ret[2].type = C_CHOICES;
-    ret[2].sval = DIFFCONFIG;
-    ret[2].ival = params->diff;
+    ret[2].u.choices.choicenames = DIFFCONFIG;
+    ret[2].u.choices.selected = params->diff;
 
     ret[3].name = NULL;
     ret[3].type = C_END;
-    ret[3].sval = NULL;
-    ret[3].ival = 0;
 
     return ret;
 }
@@ -210,14 +206,14 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->diff = cfg[2].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->diff = cfg[2].u.choices.selected;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     /*
      * (At least at the time of writing this comment) The grid
@@ -417,7 +413,7 @@ static void fill_square(int w, int h, int x, int y, int v,
 }
 
 static int vbitmap_clear(int w, int h, struct solver_scratch *sc,
-                         int x, int y, int vbits, char *reason, ...)
+                         int x, int y, int vbits, const char *reason, ...)
 {
     int done_something = FALSE;
     int vbit;
@@ -738,7 +734,7 @@ static int slant_solve(int w, int h, const signed char *clues,
                 int fs, bs, v;
                 int c1, c2;
 #ifdef SOLVER_DIAGNOSTICS
-                char *reason = "<internal error>";
+                const char *reason = "<internal error>";
 #endif
 
                 if (soln[y*w+x])
@@ -1216,7 +1212,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return desc;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int w = params->w, h = params->h, W = w+1, H = h+1;
     int area = W*H;
@@ -1460,7 +1456,7 @@ static int check_completion(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     int w = state->p.w, h = state->p.h;
     signed char *soln;
@@ -1683,7 +1679,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
     } else if (IS_CURSOR_SELECT(button)) {
         if (!ui->cur_visible) {
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
         x = ui->cur_x;
         y = ui->cur_y;
@@ -1692,7 +1688,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
     } else if (IS_CURSOR_MOVE(button)) {
         move_cursor(button, &ui->cur_x, &ui->cur_y, w, h, 0);
         ui->cur_visible = 1;
-        return "";
+        return UI_UPDATE;
     } else if (button == '\\' || button == '\b' || button == '/') {
         int x = ui->cur_x, y = ui->cur_y;
         if (button == ("\\" "\b" "/")[state->soln[y*w + x] + 1]) return NULL;
@@ -2193,7 +2189,8 @@ int main(int argc, char **argv)
 {
     game_params *p;
     game_state *s;
-    char *id = NULL, *desc, *err;
+    char *id = NULL, *desc;
+    const char *err;
     int grade = FALSE;
     int ret, diff, really_verbose = FALSE;
     struct solver_scratch *sc;
diff --git a/apps/plugins/puzzles/src/solo.c b/apps/plugins/puzzles/src/solo.c
index 0d383c39aa..ef2852f1d9 100644
--- a/apps/plugins/puzzles/src/solo.c
+++ b/apps/plugins/puzzles/src/solo.c
@@ -299,9 +299,9 @@ static game_params *dup_params(const game_params *params)
 static int game_fetch_preset(int i, char **name, game_params **params)
 {
     static struct {
-        char *title;
+        const char *title;
         game_params params;
-    } presets[] = {
+    } const presets[] = {
         { "2x2 Trivial", { 2, 2, SYMM_ROT2, DIFF_BLOCK, DIFF_KMINMAX, FALSE, FALSE } },
         { "2x3 Basic", { 2, 3, SYMM_ROT2, DIFF_SIMPLE, DIFF_KMINMAX, FALSE, FALSE } },
         { "3x3 Trivial", { 3, 3, SYMM_ROT2, DIFF_BLOCK, DIFF_KMINMAX, FALSE, FALSE } },
@@ -445,46 +445,39 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Columns of sub-blocks";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->c);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Rows of sub-blocks";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->r);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "\"X\" (require every number in each main diagonal)";
     ret[2].type = C_BOOLEAN;
-    ret[2].sval = NULL;
-    ret[2].ival = params->xtype;
+    ret[2].u.boolean.bval = params->xtype;
 
     ret[3].name = "Jigsaw (irregularly shaped sub-blocks)";
     ret[3].type = C_BOOLEAN;
-    ret[3].sval = NULL;
-    ret[3].ival = (params->r == 1);
+    ret[3].u.boolean.bval = (params->r == 1);
 
     ret[4].name = "Killer (digit sums)";
     ret[4].type = C_BOOLEAN;
-    ret[4].sval = NULL;
-    ret[4].ival = params->killer;
+    ret[4].u.boolean.bval = params->killer;
 
     ret[5].name = "Symmetry";
     ret[5].type = C_CHOICES;
-    ret[5].sval = ":None:2-way rotation:4-way rotation:2-way mirror:"
+    ret[5].u.choices.choicenames = ":None:2-way rotation:4-way rotation:2-way mirror:"
         "2-way diagonal mirror:4-way mirror:4-way diagonal mirror:"
         "8-way mirror";
-    ret[5].ival = params->symm;
+    ret[5].u.choices.selected = params->symm;
 
     ret[6].name = "Difficulty";
     ret[6].type = C_CHOICES;
-    ret[6].sval = ":Trivial:Basic:Intermediate:Advanced:Extreme:Unreasonable";
-    ret[6].ival = params->diff;
+    ret[6].u.choices.choicenames = ":Trivial:Basic:Intermediate:Advanced:Extreme:Unreasonable";
+    ret[6].u.choices.selected = params->diff;
 
     ret[7].name = NULL;
     ret[7].type = C_END;
-    ret[7].sval = NULL;
-    ret[7].ival = 0;
 
     return ret;
 }
@@ -493,22 +486,22 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->c = atoi(cfg[0].sval);
-    ret->r = atoi(cfg[1].sval);
-    ret->xtype = cfg[2].ival;
-    if (cfg[3].ival) {
+    ret->c = atoi(cfg[0].u.string.sval);
+    ret->r = atoi(cfg[1].u.string.sval);
+    ret->xtype = cfg[2].u.boolean.bval;
+    if (cfg[3].u.boolean.bval) {
         ret->c *= ret->r;
         ret->r = 1;
     }
-    ret->killer = cfg[4].ival;
-    ret->symm = cfg[5].ival;
-    ret->diff = cfg[6].ival;
+    ret->killer = cfg[4].u.boolean.bval;
+    ret->symm = cfg[5].u.choices.selected;
+    ret->diff = cfg[6].u.choices.selected;
     ret->kdiff = DIFF_KINTERSECT;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->c < 2)
         return "Both dimensions must be at least 2";
@@ -838,19 +831,20 @@ static void solver_place(struct solver_usage *usage, int x, int y, int n)
  */
 struct solver_scratch;
 static int solver_elim(struct solver_usage *usage, int *indices,
-                       char *fmt, ...) __attribute__((format(printf,3,4)));
+                       const char *fmt, ...)
+    __attribute__((format(printf,3,4)));
 static int solver_intersect(struct solver_usage *usage,
-                            int *indices1, int *indices2, char *fmt, ...)
+                            int *indices1, int *indices2, const char *fmt, ...)
     __attribute__((format(printf,4,5)));
 static int solver_set(struct solver_usage *usage,
                       struct solver_scratch *scratch,
-                      int *indices, char *fmt, ...)
+                      int *indices, const char *fmt, ...)
     __attribute__((format(printf,4,5)));
 #endif
 
 static int solver_elim(struct solver_usage *usage, int *indices
 #ifdef STANDALONE_SOLVER
-                       , char *fmt, ...
+                       , const char *fmt, ...
 #endif
                        )
 {
@@ -914,7 +908,7 @@ static int solver_elim(struct solver_usage *usage, int *indices
 static int solver_intersect(struct solver_usage *usage,
                             int *indices1, int *indices2
 #ifdef STANDALONE_SOLVER
-                            , char *fmt, ...
+                            , const char *fmt, ...
 #endif
                             )
 {
@@ -992,7 +986,7 @@ static int solver_set(struct solver_usage *usage,
                       struct solver_scratch *scratch,
                       int *indices
 #ifdef STANDALONE_SOLVER
-                      , char *fmt, ...
+                      , const char *fmt, ...
 #endif
                       )
 {
@@ -1358,7 +1352,7 @@ static int solver_forcing(struct solver_usage *usage,
                                                   (ondiag1(yt*cr+xt) && ondiag1(y*cr+x)))))) {
 #ifdef STANDALONE_SOLVER
                                 if (solver_show_working) {
-                                    char *sep = "";
+                                    const char *sep = "";
                                     int xl, yl;
                                     printf("%*sforcing chain, %d at ends of ",
                                            solver_recurse_depth*4, "", orign);
@@ -2523,7 +2517,7 @@ static void solver(int cr, struct block_structure *blocks,
 
 #ifdef STANDALONE_SOLVER
             if (solver_show_working) {
-                char *sep = "";
+                const char *sep = "";
                 printf("%*srecursing on (%d,%d) [",
                        solver_recurse_depth*4, "", x + 1, y + 1);
                 for (i = 0; i < j; i++) {
@@ -3161,7 +3155,8 @@ static int symmetries(const game_params *params, int x, int y,
 static char *encode_solve_move(int cr, digit *grid)
 {
     int i, len;
-    char *ret, *p, *sep;
+    char *ret, *p;
+    const char *sep;
 
     /*
      * It's surprisingly easy to work out _exactly_ how long this
@@ -3861,7 +3856,8 @@ static const char *spec_to_grid(const char *desc, digit *grid, int area)
  * end of the block spec, and return an error string or NULL if everything
  * is OK. The DSF is stored in *PDSF.
  */
-static char *spec_to_dsf(const char **pdesc, int **pdsf, int cr, int area)
+static const char *spec_to_dsf(const char **pdesc, int **pdsf,
+                               int cr, int area)
 {
     const char *desc = *pdesc;
     int pos = 0;
@@ -3929,7 +3925,7 @@ static char *spec_to_dsf(const char **pdesc, int **pdsf, int cr, int area)
     return NULL;
 }
 
-static char *validate_grid_desc(const char **pdesc, int range, int area)
+static const char *validate_grid_desc(const char **pdesc, int range, int area)
 {
     const char *desc = *pdesc;
     int squares = 0;
@@ -3959,11 +3955,11 @@ static char *validate_grid_desc(const char **pdesc, int range, int area)
     return NULL;
 }
 
-static char *validate_block_desc(const char **pdesc, int cr, int area,
-                                 int min_nr_blocks, int max_nr_blocks,
-                                 int min_nr_squares, int max_nr_squares)
+static const char *validate_block_desc(const char **pdesc, int cr, int area,
+                                       int min_nr_blocks, int max_nr_blocks,
+                                       int min_nr_squares, int max_nr_squares)
 {
-    char *err;
+    const char *err;
     int *dsf;
 
     err = spec_to_dsf(pdesc, &dsf, cr, area);
@@ -4036,10 +4032,10 @@ static char *validate_block_desc(const char **pdesc, int cr, int area,
     return NULL;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int cr = params->c * params->r, area = cr*cr;
-    char *err;
+    const char *err;
 
     err = validate_grid_desc(&desc, cr, area);
     if (err)
@@ -4116,7 +4112,7 @@ static game_state *new_game(midend *me, const game_params *params,
             state->immutable[i] = TRUE;
 
     if (r == 1) {
-        char *err;
+        const char *err;
         int *dsf;
         assert(*desc == ',');
         desc++;
@@ -4134,7 +4130,7 @@ static game_state *new_game(midend *me, const game_params *params,
     make_blocks_from_whichblock(state->blocks);
 
     if (params->killer) {
-        char *err;
+        const char *err;
         int *dsf;
         assert(*desc == ',');
         desc++;
@@ -4234,7 +4230,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *ai, char **error)
+                        const char *ai, const char **error)
 {
     int cr = state->cr;
     char *ret;
@@ -4586,7 +4582,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                 ui->hpencil = 0;
             }
             ui->hcursor = 0;
-            return "";                 /* UI activity occurred */
+            return UI_UPDATE;
         }
         if (button == RIGHT_BUTTON) {
             /*
@@ -4606,19 +4602,19 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                 ui->hshow = 0;
             }
             ui->hcursor = 0;
-            return "";                 /* UI activity occurred */
+            return UI_UPDATE;
         }
     }
     if (IS_CURSOR_MOVE(button)) {
         move_cursor(button, &ui->hx, &ui->hy, cr, cr, 0);
         ui->hshow = ui->hcursor = 1;
-        return "";
+        return UI_UPDATE;
     }
     if (ui->hshow &&
         (button == CURSOR_SELECT)) {
         ui->hpencil = 1 - ui->hpencil;
         ui->hcursor = 1;
-        return "";
+        return UI_UPDATE;
     }
 
     if (ui->hshow &&
@@ -5584,7 +5580,8 @@ int main(int argc, char **argv)
 {
     game_params *p;
     game_state *s;
-    char *id = NULL, *desc, *err;
+    char *id = NULL, *desc;
+    const char *err;
     int grade = FALSE;
     struct difficulty dlev;
 
diff --git a/apps/plugins/puzzles/src/tents.c b/apps/plugins/puzzles/src/tents.c
index 4ffeb7be64..48d420e5b7 100644
--- a/apps/plugins/puzzles/src/tents.c
+++ b/apps/plugins/puzzles/src/tents.c
@@ -371,24 +371,20 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Difficulty";
     ret[2].type = C_CHOICES;
-    ret[2].sval = DIFFCONFIG;
-    ret[2].ival = params->diff;
+    ret[2].u.choices.choicenames = DIFFCONFIG;
+    ret[2].u.choices.selected = params->diff;
 
     ret[3].name = NULL;
     ret[3].type = C_END;
-    ret[3].sval = NULL;
-    ret[3].ival = 0;
 
     return ret;
 }
@@ -397,14 +393,14 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->diff = cfg[2].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->diff = cfg[2].u.choices.selected;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     /*
      * Generating anything under 4x4 runs into trouble of one kind
@@ -1190,7 +1186,7 @@ static char *new_game_desc(const game_params *params_in, random_state *rs,
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int w = params->w, h = params->h;
     int area, i;
@@ -1316,7 +1312,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     int w = state->p.w, h = state->p.h;
 
@@ -1559,13 +1555,14 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         ui->dsy = ui->dey = y;
         ui->drag_ok = TRUE;
         ui->cdisp = 0;
-        return "";             /* ui updated */
+        return UI_UPDATE;
     }
 
     if ((IS_MOUSE_DRAG(button) || IS_MOUSE_RELEASE(button)) &&
         ui->drag_button > 0) {
         int xmin, ymin, xmax, ymax;
-        char *buf, *sep;
+        char *buf;
+        const char *sep;
         int buflen, bufsize, tmplen;
 
         x = FROMCOORD(x);
@@ -1590,14 +1587,14 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         }
 
         if (IS_MOUSE_DRAG(button))
-            return "";                 /* ui updated */
+            return UI_UPDATE;
 
         /*
          * The drag has been released. Enact it.
          */
         if (!ui->drag_ok) {
             ui->drag_button = -1;
-            return "";                 /* drag was just cancelled */
+            return UI_UPDATE;          /* drag was just cancelled */
         }
 
         xmin = min(ui->dsx, ui->dex);
@@ -1635,7 +1632,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
 
         if (buflen == 0) {
             sfree(buf);
-            return "";                 /* ui updated (drag was terminated) */
+            return UI_UPDATE;          /* drag was terminated */
         } else {
             buf[buflen] = '\0';
             return buf;
@@ -1663,7 +1660,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             if (len) return dupstr(tmpbuf);
         } else
             move_cursor(button, &ui->cx, &ui->cy, w, h, 0);
-        return "";
+        return UI_UPDATE;
     }
     if (ui->cdisp) {
         char rep = 0;
@@ -1690,7 +1687,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         }
     } else if (IS_CURSOR_SELECT(button)) {
         ui->cdisp = 1;
-        return "";
+        return UI_UPDATE;
     }
 
     return NULL;
@@ -2654,7 +2651,8 @@ int main(int argc, char **argv)
 {
     game_params *p;
     game_state *s, *s2;
-    char *id = NULL, *desc, *err;
+    char *id = NULL, *desc;
+    const char *err;
     int grade = FALSE;
     int ret, diff, really_verbose = FALSE;
     struct solver_scratch *sc;
diff --git a/apps/plugins/puzzles/src/towers.c b/apps/plugins/puzzles/src/towers.c
index a3a7e55a45..9ccc6ae185 100644
--- a/apps/plugins/puzzles/src/towers.c
+++ b/apps/plugins/puzzles/src/towers.c
@@ -212,18 +212,15 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Grid size";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Difficulty";
     ret[1].type = C_CHOICES;
-    ret[1].sval = DIFFCONFIG;
-    ret[1].ival = params->diff;
+    ret[1].u.choices.choicenames = DIFFCONFIG;
+    ret[1].u.choices.selected = params->diff;
 
     ret[2].name = NULL;
     ret[2].type = C_END;
-    ret[2].sval = NULL;
-    ret[2].ival = 0;
 
     return ret;
 }
@@ -232,13 +229,13 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->diff = cfg[1].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->diff = cfg[1].u.choices.selected;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 3 || params->w > 9)
         return "Grid size must be between 3 and 9";
@@ -802,7 +799,7 @@ done
  * Gameplay.
  */
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int w = params->w, a = w*w;
     const char *p = desc;
@@ -970,7 +967,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     int w = state->par.w, a = w*w;
     int i, ret;
@@ -1349,7 +1346,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                 ui->hpencil = 0;
             }
             ui->hcursor = 0;
-            return "";                 /* UI activity occurred */
+            return UI_UPDATE;
         }
         if (button == RIGHT_BUTTON) {
             /*
@@ -1369,7 +1366,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                 ui->hshow = 0;
             }
             ui->hcursor = 0;
-            return "";                 /* UI activity occurred */
+            return UI_UPDATE;
         }
     } else if (button == LEFT_BUTTON) {
         if (is_clue(state, tx, ty)) {
@@ -1394,13 +1391,13 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         }
         move_cursor(button, &ui->hx, &ui->hy, w, w, 0);
         ui->hshow = ui->hcursor = 1;
-        return "";
+        return UI_UPDATE;
     }
     if (ui->hshow &&
         (button == CURSOR_SELECT)) {
         ui->hpencil = 1 - ui->hpencil;
         ui->hcursor = 1;
-        return "";
+        return UI_UPDATE;
     }
 
     if (ui->hshow &&
@@ -2021,7 +2018,8 @@ int main(int argc, char **argv)
 {
     game_params *p;
     game_state *s;
-    char *id = NULL, *desc, *err;
+    char *id = NULL, *desc;
+    const char *err;
     int grade = FALSE;
     int ret, diff, really_show_working = FALSE;
 
diff --git a/apps/plugins/puzzles/src/tracks.c b/apps/plugins/puzzles/src/tracks.c
index 578813b1a3..3899007c94 100644
--- a/apps/plugins/puzzles/src/tracks.c
+++ b/apps/plugins/puzzles/src/tracks.c
@@ -148,28 +148,24 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Difficulty";
     ret[2].type = C_CHOICES;
-    ret[2].sval = DIFFCONFIG;
-    ret[2].ival = params->diff;
+    ret[2].u.choices.choicenames = DIFFCONFIG;
+    ret[2].u.choices.selected = params->diff;
 
     ret[3].name = "Disallow consecutive 1 clues";
     ret[3].type = C_BOOLEAN;
-    ret[3].ival = params->single_ones;
+    ret[3].u.boolean.bval = params->single_ones;
 
     ret[4].name = NULL;
     ret[4].type = C_END;
-    ret[4].sval = NULL;
-    ret[4].ival = 0;
 
     return ret;
 }
@@ -178,15 +174,15 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->diff = cfg[2].ival;
-    ret->single_ones = cfg[3].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->diff = cfg[2].u.choices.selected;
+    ret->single_ones = cfg[3].u.boolean.bval;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     /*
      * Generating anything under 4x4 runs into trouble of one kind
@@ -786,7 +782,7 @@ newpath:
     return desc;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int i = 0, w = params->w, h = params->h, in = 0, out = 0;
 
@@ -1368,7 +1364,7 @@ static char *move_string_diff(const game_state *before, const game_state *after,
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     game_state *solved;
     int ret;
@@ -1922,13 +1918,13 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         ui->drag_sx = ui->drag_ex = gx;
         ui->drag_sy = ui->drag_ey = gy;
 
-        return "";
+        return UI_UPDATE;
     }
 
     if (IS_MOUSE_DRAG(button)) {
         ui->cursor_active = FALSE;
         update_ui_drag(state, ui, gx, gy);
-        return "";
+        return UI_UPDATE;
     }
 
     if (IS_MOUSE_RELEASE(button)) {
@@ -1965,12 +1961,12 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             cy = CENTERED_COORD(gy);
 
             if (!INGRID(state, gx, gy) || FROMCOORD(x) != gx || FROMCOORD(y) != gy)
-                return "";
+                return UI_UPDATE;
 
             if (max(abs(x-cx),abs(y-cy)) < TILE_SIZE/4) {
                 if (ui_can_flip_square(state, gx, gy, button == RIGHT_RELEASE))
                     return square_flip_str(state, gx, gy, button == RIGHT_RELEASE, tmpbuf);
-                return "";
+                return UI_UPDATE;
             } else {
                 if (abs(x-cx) < abs(y-cy)) {
                     /* Closest to top/bottom edge. */
@@ -1984,7 +1980,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                     return edge_flip_str(state, gx, gy, direction,
                             button == RIGHT_RELEASE, tmpbuf);
                 else
-                    return "";
+                    return UI_UPDATE;
             }
         }
     }
@@ -1997,7 +1993,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
 
         if (!ui->cursor_active) {
             ui->cursor_active = TRUE;
-            return "";
+            return UI_UPDATE;
         }
 
         ui->curx = ui->curx + dx;
@@ -2008,17 +2004,17 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         }
         ui->curx = min(max(ui->curx, 1), 2*w-1);
         ui->cury = min(max(ui->cury, 1), 2*h-1);
-        return "";
+        return UI_UPDATE;
     }
 
     if (IS_CURSOR_SELECT(button)) {
         if (!ui->cursor_active) {
             ui->cursor_active = TRUE;
-            return "";
+            return UI_UPDATE;
         }
         /* click on square corner does nothing (shouldn't get here) */
         if ((ui->curx % 2) == 0 && (ui->cury % 2 == 0))
-            return "";
+            return UI_UPDATE;
 
         gx = ui->curx / 2;
         gy = ui->cury / 2;
@@ -2030,7 +2026,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         else if (!direction &&
                  ui_can_flip_square(state, gx, gy, button == CURSOR_SELECT2))
             return square_flip_str(state, gx, gy, button == CURSOR_SELECT2, tmpbuf);
-        return "";
+        return UI_UPDATE;
     }
 
 #if 0
@@ -2140,7 +2136,7 @@ enum {
     COL_GRID, COL_CLUE, COL_CURSOR,
     COL_TRACK, COL_TRACK_CLUE, COL_SLEEPER,
     COL_DRAGON, COL_DRAGOFF,
-    COL_ERROR, COL_FLASH,
+    COL_ERROR, COL_FLASH, COL_ERROR_BACKGROUND,
     NCOLOURS
 };
 
@@ -2152,11 +2148,12 @@ static float *game_colours(frontend *fe, int *ncolours)
     game_mkhighlight(fe, ret, COL_BACKGROUND, COL_HIGHLIGHT, COL_LOWLIGHT);
 
     for (i = 0; i < 3; i++) {
-        ret[COL_TRACK_CLUE * 3 + i] = 0.0F;
-        ret[COL_TRACK * 3 + i] = 0.5F;
-        ret[COL_CLUE * 3 + i] = 0.0F;
-        ret[COL_GRID * 3 + i] = 0.75F;
-        ret[COL_CURSOR * 3 + i] = 0.6F;
+        ret[COL_TRACK_CLUE       * 3 + i] = 0.0F;
+        ret[COL_TRACK            * 3 + i] = 0.5F;
+        ret[COL_CLUE             * 3 + i] = 0.0F;
+        ret[COL_GRID             * 3 + i] = 0.75F;
+        ret[COL_CURSOR           * 3 + i] = 0.6F;
+        ret[COL_ERROR_BACKGROUND * 3 + i] = 1.0F;
     }
 
     ret[COL_SLEEPER * 3 + 0] = 0.5F;
@@ -2417,7 +2414,7 @@ static void draw_square(drawing *dr, game_drawstate *ds,
     draw_update(dr, ox, oy, TILE_SIZE, TILE_SIZE);
 }
 
-static void draw_clue(drawing *dr, game_drawstate *ds, int w, int clue, int i, int col)
+static void draw_clue(drawing *dr, game_drawstate *ds, int w, int clue, int i, int col, int bg)
 {
     int cx, cy, tsz = TILE_SIZE/2;
     char buf[20];
@@ -2432,7 +2429,7 @@ static void draw_clue(drawing *dr, game_drawstate *ds, int w, int clue, int i, i
 
     draw_rect(dr, cx - tsz + GRID_LINE_TL, cy - tsz + GRID_LINE_TL,
               TILE_SIZE - GRID_LINE_ALL, TILE_SIZE - GRID_LINE_ALL,
-              COL_BACKGROUND);
+              bg);
     sprintf(buf, "%d", clue);
     draw_text(dr, cx, cy, FONT_VARIABLE, tsz, ALIGN_VCENTRE|ALIGN_HCENTRE,
               col, buf);
@@ -2518,7 +2515,8 @@ static void game_redraw(drawing *dr, game_drawstate *ds, const game_state *oldst
         if (force || (state->num_errors[i] != ds->num_errors[i])) {
             ds->num_errors[i] = state->num_errors[i];
             draw_clue(dr, ds, w, state->numbers->numbers[i], i,
-                      ds->num_errors[i] ? COL_ERROR : COL_CLUE);
+                      ds->num_errors[i] ? COL_ERROR : COL_CLUE,
+                      ds->num_errors[i] ? COL_ERROR_BACKGROUND : COL_BACKGROUND);
         }
     }
 
@@ -2608,7 +2606,8 @@ static void game_print(drawing *dr, const game_state *state, int tilesize)
 
     /* clue numbers, and loop ends */
     for (i = 0; i < w+h; i++)
-        draw_clue(dr, ds, w, state->numbers->numbers[i], i, black);
+        draw_clue(dr, ds, w, state->numbers->numbers[i], i,
+                  black, COL_BACKGROUND);
     draw_loop_ends(dr, ds, state, black);
 
     /* clue tracks / solution */
diff --git a/apps/plugins/puzzles/src/twiddle.c b/apps/plugins/puzzles/src/twiddle.c
index 224c0418f1..cbf6f761ef 100644
--- a/apps/plugins/puzzles/src/twiddle.c
+++ b/apps/plugins/puzzles/src/twiddle.c
@@ -80,9 +80,9 @@ static game_params *dup_params(const game_params *params)
 static int game_fetch_preset(int i, char **name, game_params **params)
 {
     static struct {
-        char *title;
+        const char *title;
         game_params params;
-    } presets[] = {
+    } const presets[] = {
         { "3x3 rows only", { 3, 3, 2, TRUE, FALSE } },
         { "3x3 normal", { 3, 3, 2, FALSE, FALSE } },
         { "3x3 orientable", { 3, 3, 2, FALSE, TRUE } },
@@ -156,41 +156,33 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Rotating block size";
     ret[2].type = C_STRING;
     sprintf(buf, "%d", params->n);
-    ret[2].sval = dupstr(buf);
-    ret[2].ival = 0;
+    ret[2].u.string.sval = dupstr(buf);
 
     ret[3].name = "One number per row";
     ret[3].type = C_BOOLEAN;
-    ret[3].sval = NULL;
-    ret[3].ival = params->rowsonly;
+    ret[3].u.boolean.bval = params->rowsonly;
 
     ret[4].name = "Orientation matters";
     ret[4].type = C_BOOLEAN;
-    ret[4].sval = NULL;
-    ret[4].ival = params->orientable;
+    ret[4].u.boolean.bval = params->orientable;
 
     ret[5].name = "Number of shuffling moves";
     ret[5].type = C_STRING;
     sprintf(buf, "%d", params->movetarget);
-    ret[5].sval = dupstr(buf);
-    ret[5].ival = 0;
+    ret[5].u.string.sval = dupstr(buf);
 
     ret[6].name = NULL;
     ret[6].type = C_END;
-    ret[6].sval = NULL;
-    ret[6].ival = 0;
 
     return ret;
 }
@@ -199,17 +191,17 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->n = atoi(cfg[2].sval);
-    ret->rowsonly = cfg[3].ival;
-    ret->orientable = cfg[4].ival;
-    ret->movetarget = atoi(cfg[5].sval);
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->n = atoi(cfg[2].u.string.sval);
+    ret->rowsonly = cfg[3].u.boolean.bval;
+    ret->orientable = cfg[4].u.boolean.bval;
+    ret->movetarget = atoi(cfg[5].u.string.sval);
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->n < 2)
         return "Rotating block size must be at least two";
@@ -432,7 +424,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     const char *p;
     int w = params->w, h = params->h, wh = w*h;
@@ -543,7 +535,7 @@ static int compare_int(const void *av, const void *bv)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     return dupstr("S");
 }
@@ -663,7 +655,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         if (button == CURSOR_DOWN && (ui->cur_y+n) < (h))
             ui->cur_y++;
         ui->cur_visible = 1;
-        return "";
+        return UI_UPDATE;
     }
 
     if (button == LEFT_BUTTON || button == RIGHT_BUTTON) {
@@ -687,7 +679,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             dir = (button == CURSOR_SELECT2) ? -1 : +1;
         } else {
             ui->cur_visible = 1;
-            return "";
+            return UI_UPDATE;
         }
     } else if (button == 'a' || button == 'A' || button==MOD_NUM_KEYPAD+'7') {
         x = y = 0;
diff --git a/apps/plugins/puzzles/src/undead.c b/apps/plugins/puzzles/src/undead.c
index b1f536e8d0..df0735e469 100644
--- a/apps/plugins/puzzles/src/undead.c
+++ b/apps/plugins/puzzles/src/undead.c
@@ -163,24 +163,20 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Difficulty";
     ret[2].type = C_CHOICES;
-    ret[2].sval = DIFFCONFIG;
-    ret[2].ival = params->diff;
+    ret[2].u.choices.choicenames = DIFFCONFIG;
+    ret[2].u.choices.selected = params->diff;
 
     ret[3].name = NULL;
     ret[3].type = C_END;
-    ret[3].sval = NULL;
-    ret[3].ival = 0;
 
     return ret;
 }
@@ -189,13 +185,13 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->diff = cfg[2].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->diff = cfg[2].u.choices.selected;
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if ((params->w * params->h ) > 54)  return "Grid is too big";
     if (params->w < 3)                  return "Width must be at least 3";
@@ -1440,7 +1436,7 @@ static game_state *new_game(midend *me, const game_params *params,
     return state;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int i;
     int w = params->w, h = params->h;
@@ -1493,7 +1489,7 @@ static char *validate_desc(const game_params *params, const char *desc)
 }
 
 static char *solve_game(const game_state *state_start, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     int p;
     int *old_guess;
@@ -1725,7 +1721,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
 
     if (button == 'a' || button == 'A') {
         ui->ascii = !ui->ascii;
-        return "";      
+        return UI_UPDATE;
     }
 
     if (button == 'm' || button == 'M') {
@@ -1771,12 +1767,12 @@ static char *interpret_move(const game_state *state, game_ui *ui,
               case CURSOR_LEFT:   ui->hx -= (ui->hx > 1)     ? 1 : 0; break;
             }
         ui->hshow = ui->hcursor = 1;
-        return "";
+        return UI_UPDATE;
     }
     if (ui->hshow && button == CURSOR_SELECT) {
         ui->hpencil = 1 - ui->hpencil;
         ui->hcursor = 1;
-        return "";
+        return UI_UPDATE;
     }
 
     if (ui->hshow == 1 && ui->hpencil == 1) {
@@ -1814,12 +1810,12 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                 if (button == LEFT_BUTTON) {
                     ui->hshow = 1; ui->hpencil = 0; ui->hcursor = 0;
                     ui->hx = gx; ui->hy = gy;
-                    return "";
+                    return UI_UPDATE;
                 }
                 else if (button == RIGHT_BUTTON && g == 7) {
                     ui->hshow = 1; ui->hpencil = 1; ui->hcursor = 0;
                     ui->hx = gx; ui->hy = gy;
-                    return "";
+                    return UI_UPDATE;
                 }
             }
             else if (ui->hshow == 1) {
@@ -1828,36 +1824,36 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                         if (gx == ui->hx && gy == ui->hy) {
                             ui->hshow = 0; ui->hpencil = 0; ui->hcursor = 0;
                             ui->hx = 0; ui->hy = 0;
-                            return "";
+                            return UI_UPDATE;
                         }
                         else {
                             ui->hshow = 1; ui->hpencil = 0; ui->hcursor = 0;
                             ui->hx = gx; ui->hy = gy;
-                            return "";
+                            return UI_UPDATE;
                         }
                     }
                     else {
                         ui->hshow = 1; ui->hpencil = 0; ui->hcursor = 0;
                         ui->hx = gx; ui->hy = gy;
-                        return "";
+                        return UI_UPDATE;
                     }
                 }
                 else if (button == RIGHT_BUTTON) {
                     if (ui->hpencil == 0 && g == 7) {
                         ui->hshow = 1; ui->hpencil = 1; ui->hcursor = 0;
                         ui->hx = gx; ui->hy = gy;
-                        return "";
+                        return UI_UPDATE;
                     }
                     else {
                         if (gx == ui->hx && gy == ui->hy) {
                             ui->hshow = 0; ui->hpencil = 0; ui->hcursor = 0;
                             ui->hx = 0; ui->hy = 0;
-                            return "";
+                            return UI_UPDATE;
                         }
                         else if (g == 7) {
                             ui->hshow = 1; ui->hpencil = 1; ui->hcursor = 0;
                             ui->hx = gx; ui->hy = gy;
-                            return "";
+                            return UI_UPDATE;
                         }
                     }
                 }
diff --git a/apps/plugins/puzzles/src/unequal.c b/apps/plugins/puzzles/src/unequal.c
index a63b7d8ed0..cb477c9e37 100644
--- a/apps/plugins/puzzles/src/unequal.c
+++ b/apps/plugins/puzzles/src/unequal.c
@@ -218,24 +218,21 @@ static config_item *game_configure(const game_params *params)
 
     ret[0].name = "Mode";
     ret[0].type = C_CHOICES;
-    ret[0].sval = ":Unequal:Adjacent";
-    ret[0].ival = params->adjacent;
+    ret[0].u.choices.choicenames = ":Unequal:Adjacent";
+    ret[0].u.choices.selected = params->adjacent;
 
     ret[1].name = "Size (s*s)";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->order);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Difficulty";
     ret[2].type = C_CHOICES;
-    ret[2].sval = DIFFCONFIG;
-    ret[2].ival = params->diff;
+    ret[2].u.choices.choicenames = DIFFCONFIG;
+    ret[2].u.choices.selected = params->diff;
 
     ret[3].name = NULL;
     ret[3].type = C_END;
-    ret[3].sval = NULL;
-    ret[3].ival = 0;
 
     return ret;
 }
@@ -244,14 +241,14 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->adjacent = cfg[0].ival;
-    ret->order = atoi(cfg[1].sval);
-    ret->diff = cfg[2].ival;
+    ret->adjacent = cfg[0].u.choices.selected;
+    ret->order = atoi(cfg[1].u.string.sval);
+    ret->diff = cfg[2].u.choices.selected;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->order < 3 || params->order > 32)
         return "Order must be between 3 and 32";
@@ -1198,12 +1195,12 @@ generate:
 }
 
 static game_state *load_game(const game_params *params, const char *desc,
-                             char **why_r)
+                             const char **why_r)
 {
     game_state *state = blank_game(params->order, params->adjacent);
     const char *p = desc;
     int i = 0, n, o = params->order, x, y;
-    char *why = NULL;
+    const char *why = NULL;
 
     while (*p) {
         while (*p >= 'a' && *p <= 'z') {
@@ -1294,9 +1291,9 @@ static game_state *new_game(midend *me, const game_params *params,
     return state;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
-    char *why = NULL;
+    const char *why = NULL;
     game_state *dummy = load_game(params, desc, &why);
     if (dummy) {
         free_game(dummy);
@@ -1307,7 +1304,7 @@ static char *validate_desc(const game_params *params, const char *desc)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     game_state *solved;
     int r;
@@ -1425,7 +1422,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                 ui->hshow = 1;
             }
             ui->hcursor = 0;
-            return "";
+            return UI_UPDATE;
         }
         if (button == RIGHT_BUTTON) {
             /* pencil highlighting for non-filled squares */
@@ -1439,7 +1436,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                 ui->hshow = 1;
             }
             ui->hcursor = 0;
-            return "";
+            return UI_UPDATE;
         }
     }
 
@@ -1453,11 +1450,12 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                                   ny != ui->hy + adjthan[i].dy); ++i);
 
             if (i == 4)
-                return ""; /* invalid direction, i.e. out of the board */
+                return UI_UPDATE; /* invalid direction, i.e. out of
+                                   * the board */
 
             if (!(GRID(state, flags, ui->hx, ui->hy) & adjthan[i].f ||
                   GRID(state, flags, nx,     ny    ) & adjthan[i].fo))
-                return ""; /* no clue to toggle */
+                return UI_UPDATE; /* no clue to toggle */
 
             if (state->adjacent)
                 self = (adjthan[i].dx >= 0 && adjthan[i].dy >= 0);
@@ -1475,13 +1473,13 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         } else {
             move_cursor(button, &ui->hx, &ui->hy, ds->order, ds->order, FALSE);
             ui->hshow = ui->hcursor = 1;
-            return "";
+            return UI_UPDATE;
         }
     }
     if (ui->hshow && IS_CURSOR_SELECT(button)) {
         ui->hpencil = 1 - ui->hpencil;
         ui->hcursor = 1;
-        return "";
+        return UI_UPDATE;
     }
 
     n = c2n(button, state->order);
@@ -1568,7 +1566,9 @@ static game_state *execute_move(const game_state *state, const char *move)
         }
         return ret;
     } else if (move[0] == 'H') {
-        return solver_hint(state, NULL, DIFF_EASY, DIFF_EASY);
+        ret = solver_hint(state, NULL, DIFF_EASY, DIFF_EASY);
+        check_complete(ret->nums, ret, 1);
+        return ret;
     } else if (move[0] == 'F' && sscanf(move+1, "%d,%d,%d", &x, &y, &n) == 3 &&
                x >= 0 && x < state->order && y >= 0 && y < state->order) {
         ret = dup_game(state);
@@ -2041,7 +2041,7 @@ const char *quis = NULL;
 
 #if 0 /* currently unused */
 
-static void debug_printf(char *fmt, ...)
+static void debug_printf(const char *fmt, ...)
 {
     char buf[4096];
     va_list ap;
@@ -2125,7 +2125,7 @@ static int solve(game_params *p, char *desc, int debug)
 
 static void check(game_params *p)
 {
-    char *msg = validate_params(p, 1);
+    const char *msg = validate_params(p, 1);
     if (msg) {
         fprintf(stderr, "%s: %s", quis, msg);
         exit(1);
@@ -2233,7 +2233,8 @@ int main(int argc, const char *argv[])
         int i;
         for (i = 0; i < argc; i++) {
             const char *id = *argv++;
-            char *desc = strchr(id, ':'), *err;
+            char *desc = strchr(id, ':');
+            const char *err;
             p = default_params();
             if (desc) {
                 *desc++ = '\0';
diff --git a/apps/plugins/puzzles/src/unfinished/group.c b/apps/plugins/puzzles/src/unfinished/group.c
index 4a4ad6ce53..b812b041eb 100644
--- a/apps/plugins/puzzles/src/unfinished/group.c
+++ b/apps/plugins/puzzles/src/unfinished/group.c
@@ -212,23 +212,19 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Grid size";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Difficulty";
     ret[1].type = C_CHOICES;
-    ret[1].sval = DIFFCONFIG;
-    ret[1].ival = params->diff;
+    ret[1].u.choices.choicenames = DIFFCONFIG;
+    ret[1].u.choices.selected = params->diff;
 
     ret[2].name = "Show identity";
     ret[2].type = C_BOOLEAN;
-    ret[2].sval = NULL;
-    ret[2].ival = params->id;
+    ret[2].u.boolean.bval = params->id;
 
     ret[3].name = NULL;
     ret[3].type = C_END;
-    ret[3].sval = NULL;
-    ret[3].ival = 0;
 
     return ret;
 }
@@ -237,14 +233,14 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->diff = cfg[1].ival;
-    ret->id = cfg[2].ival;
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->diff = cfg[1].u.choices.selected;
+    ret->id = cfg[2].u.boolean.bval;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 3 || params->w > 26)
         return "Grid size must be between 3 and 26";
@@ -781,7 +777,7 @@ done
  * Gameplay.
  */
 
-static char *validate_grid_desc(const char **pdesc, int range, int area)
+static const char *validate_grid_desc(const char **pdesc, int range, int area)
 {
     const char *desc = *pdesc;
     int squares = 0;
@@ -811,7 +807,7 @@ static char *validate_grid_desc(const char **pdesc, int range, int area)
     return NULL;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int w = params->w, a = w*w;
     const char *p = desc;
@@ -911,7 +907,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     int w = state->par.w, a = w*w;
     int i, ret;
@@ -1281,13 +1277,13 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             ui->drag |= 4;             /* some movement has happened */
             if (tcoord >= 0 && tcoord < w) {
                 ui->dragpos = tcoord;
-                return "";
+                return UI_UPDATE;
             }
         } else if (IS_MOUSE_RELEASE(button)) {
             if (ui->drag & 4) {
                 ui->drag = 0;          /* end drag */
                 if (state->sequence[ui->dragpos] == ui->dragnum)
-                    return "";         /* drag was a no-op overall */
+                    return UI_UPDATE;  /* drag was a no-op overall */
                 sprintf(buf, "D%d,%d", ui->dragnum, ui->dragpos);
                 return dupstr(buf);
             } else {
@@ -1298,7 +1294,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                             state->sequence[ui->edgepos]);
                     return dupstr(buf);
                 } else
-                    return "";         /* no-op */
+                    return UI_UPDATE;  /* no-op */
             }
         }
     } else if (IS_MOUSE_DOWN(button)) {
@@ -1321,7 +1317,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                     ui->hpencil = 0;
                 }
                 ui->hcursor = 0;
-                return "";                     /* UI activity occurred */
+                return UI_UPDATE;
             }
             if (button == RIGHT_BUTTON) {
                 /*
@@ -1345,20 +1341,20 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                     ui->hshow = 0;
                 }
                 ui->hcursor = 0;
-                return "";                     /* UI activity occurred */
+                return UI_UPDATE;
             }
         } else if (tx >= 0 && tx < w && ty == -1) {
             ui->drag = 2;
             ui->dragnum = state->sequence[tx];
             ui->dragpos = tx;
             ui->edgepos = FROMCOORD(x + TILESIZE/2);
-            return "";
+            return UI_UPDATE;
         } else if (ty >= 0 && ty < w && tx == -1) {
             ui->drag = 1;
             ui->dragnum = state->sequence[ty];
             ui->dragpos = ty;
             ui->edgepos = FROMCOORD(y + TILESIZE/2);
-            return "";
+            return UI_UPDATE;
         }
     } else if (IS_MOUSE_DRAG(button)) {
         if (!ui->hpencil &&
@@ -1371,7 +1367,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             ui->odx = ui->ody = 0;
             ui->odn = 1;
         }
-        return "";
+        return UI_UPDATE;
     }
 
     if (IS_CURSOR_MOVE(button)) {
@@ -1381,13 +1377,13 @@ static char *interpret_move(const game_state *state, game_ui *ui,
         ui->hx = state->sequence[cx];
         ui->hy = state->sequence[cy];
         ui->hshow = ui->hcursor = 1;
-        return "";
+        return UI_UPDATE;
     }
     if (ui->hshow &&
         (button == CURSOR_SELECT)) {
         ui->hpencil = 1 - ui->hpencil;
         ui->hcursor = 1;
-        return "";
+        return UI_UPDATE;
     }
 
     if (ui->hshow &&
@@ -2110,7 +2106,8 @@ int main(int argc, char **argv)
 {
     game_params *p;
     game_state *s;
-    char *id = NULL, *desc, *err;
+    char *id = NULL, *desc;
+    const char *err;
     digit *grid;
     int grade = FALSE;
     int ret, diff, really_show_working = FALSE;
diff --git a/apps/plugins/puzzles/src/unfinished/path.c b/apps/plugins/puzzles/src/unfinished/path.c
index 61d6c61c6a..d4ec5d87cc 100644
--- a/apps/plugins/puzzles/src/unfinished/path.c
+++ b/apps/plugins/puzzles/src/unfinished/path.c
@@ -770,7 +770,7 @@ int main(void)
 #ifdef TEST_GENERAL
 #include <stdarg.h>
 
-void fatal(char *fmt, ...)
+void fatal(const char *fmt, ...)
 {
     va_list ap;
 
diff --git a/apps/plugins/puzzles/src/unfinished/separate.c b/apps/plugins/puzzles/src/unfinished/separate.c
index a7b4fc96e1..7fd8da8202 100644
--- a/apps/plugins/puzzles/src/unfinished/separate.c
+++ b/apps/plugins/puzzles/src/unfinished/separate.c
@@ -170,7 +170,7 @@ static game_params *custom_params(const config_item *cfg)
     return NULL;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     return NULL;
 }
@@ -646,7 +646,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return desc;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     return NULL;
 }
@@ -676,7 +676,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     return NULL;
 }
diff --git a/apps/plugins/puzzles/src/unfinished/slide.c b/apps/plugins/puzzles/src/unfinished/slide.c
index 9d4fce1461..9770013235 100644
--- a/apps/plugins/puzzles/src/unfinished/slide.c
+++ b/apps/plugins/puzzles/src/unfinished/slide.c
@@ -244,25 +244,20 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Solution length limit";
     ret[2].type = C_STRING;
     sprintf(buf, "%d", params->maxmoves);
-    ret[2].sval = dupstr(buf);
-    ret[2].ival = 0;
+    ret[2].u.string.sval = dupstr(buf);
 
     ret[3].name = NULL;
     ret[3].type = C_END;
-    ret[3].sval = NULL;
-    ret[3].ival = 0;
 
     return ret;
 }
@@ -271,14 +266,14 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
-    ret->maxmoves = atoi(cfg[2].sval);
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
+    ret->maxmoves = atoi(cfg[2].u.string.sval);
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w > MAXWID)
         return "Width must be at most " STR(MAXWID);
@@ -891,7 +886,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int w = params->w, h = params->h, wh = w*h;
     int *active, *link;
@@ -1126,7 +1121,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     int *moves;
     int nmoves;
@@ -1349,7 +1344,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
          * And that's it. Update the display to reflect the start
          * of a drag.
          */
-        return "";
+        return UI_UPDATE;
     } else if (button == LEFT_DRAG && ui->dragging) {
         int dist, distlimit, dx, dy, s, px, py;
 
@@ -1376,7 +1371,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
                     if (px >= 0 && px < w && py >= 0 && py < h &&
                         ui->reachable[py*w+px]) {
                         ui->drag_currpos = py*w+px;
-                        return "";
+                        return UI_UPDATE;
                     }
                 }
         }
diff --git a/apps/plugins/puzzles/src/unfinished/sokoban.c b/apps/plugins/puzzles/src/unfinished/sokoban.c
index 2f0af35bc2..1264690416 100644
--- a/apps/plugins/puzzles/src/unfinished/sokoban.c
+++ b/apps/plugins/puzzles/src/unfinished/sokoban.c
@@ -210,19 +210,15 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = NULL;
     ret[2].type = C_END;
-    ret[2].sval = NULL;
-    ret[2].ival = 0;
 
     return ret;
 }
@@ -231,13 +227,13 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w = atoi(cfg[0].sval);
-    ret->h = atoi(cfg[1].sval);
+    ret->w = atoi(cfg[0].u.string.sval);
+    ret->h = atoi(cfg[1].u.string.sval);
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->w < 4 || params->h < 4)
         return "Width and height must both be at least 4";
@@ -806,7 +802,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return desc;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int w = params->w, h = params->h;
     int area = 0;
@@ -903,7 +899,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     return NULL;
 }
diff --git a/apps/plugins/puzzles/src/unruly.c b/apps/plugins/puzzles/src/unruly.c
index f418efa776..9d2d5924d2 100644
--- a/apps/plugins/puzzles/src/unruly.c
+++ b/apps/plugins/puzzles/src/unruly.c
@@ -239,28 +239,24 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Width";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->w2);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = "Height";
     ret[1].type = C_STRING;
     sprintf(buf, "%d", params->h2);
-    ret[1].sval = dupstr(buf);
-    ret[1].ival = 0;
+    ret[1].u.string.sval = dupstr(buf);
 
     ret[2].name = "Unique rows and columns";
     ret[2].type = C_BOOLEAN;
-    ret[2].ival = params->unique;
+    ret[2].u.boolean.bval = params->unique;
 
     ret[3].name = "Difficulty";
     ret[3].type = C_CHOICES;
-    ret[3].sval = DIFFCONFIG;
-    ret[3].ival = params->diff;
+    ret[3].u.choices.choicenames = DIFFCONFIG;
+    ret[3].u.choices.selected = params->diff;
 
     ret[4].name = NULL;
     ret[4].type = C_END;
-    ret[4].sval = NULL;
-    ret[4].ival = 0;
 
     return ret;
 }
@@ -269,15 +265,15 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->w2 = atoi(cfg[0].sval);
-    ret->h2 = atoi(cfg[1].sval);
-    ret->unique = cfg[2].ival;
-    ret->diff = cfg[3].ival;
+    ret->w2 = atoi(cfg[0].u.string.sval);
+    ret->h2 = atoi(cfg[1].u.string.sval);
+    ret->unique = cfg[2].u.boolean.bval;
+    ret->diff = cfg[3].u.choices.selected;
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if ((params->w2 & 1) || (params->h2 & 1))
         return "Width and height must both be even";
@@ -319,7 +315,7 @@ static char *validate_params(const game_params *params, int full)
     return NULL;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int w2 = params->w2, h2 = params->h2;
     int s = w2 * h2;
@@ -1178,7 +1174,7 @@ static int unruly_solve_game(game_state *state,
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     game_state *solved = dup_game(state);
     struct unruly_scratch *scratch = unruly_new_scratch(solved);
@@ -1531,7 +1527,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
     if (IS_CURSOR_MOVE(button)) {
         move_cursor(button, &ui->cx, &ui->cy, w2, h2, 0);
         ui->cursor = TRUE;
-        return "";
+        return UI_UPDATE;
     }
 
     /* Place one */
@@ -1976,7 +1972,8 @@ int main(int argc, char *argv[])
 
     game_params *params = NULL;
 
-    char *id = NULL, *desc = NULL, *err;
+    char *id = NULL, *desc = NULL;
+    const char *err;
 
     quis = argv[0];
 
diff --git a/apps/plugins/puzzles/src/untangle.c b/apps/plugins/puzzles/src/untangle.c
index 441c8658ce..6c2eb30deb 100644
--- a/apps/plugins/puzzles/src/untangle.c
+++ b/apps/plugins/puzzles/src/untangle.c
@@ -187,13 +187,10 @@ static config_item *game_configure(const game_params *params)
     ret[0].name = "Number of points";
     ret[0].type = C_STRING;
     sprintf(buf, "%d", params->n);
-    ret[0].sval = dupstr(buf);
-    ret[0].ival = 0;
+    ret[0].u.string.sval = dupstr(buf);
 
     ret[1].name = NULL;
     ret[1].type = C_END;
-    ret[1].sval = NULL;
-    ret[1].ival = 0;
 
     return ret;
 }
@@ -202,12 +199,12 @@ static game_params *custom_params(const config_item *cfg)
 {
     game_params *ret = snew(game_params);
 
-    ret->n = atoi(cfg[0].sval);
+    ret->n = atoi(cfg[0].u.string.sval);
 
     return ret;
 }
 
-static char *validate_params(const game_params *params, int full)
+static const char *validate_params(const game_params *params, int full)
 {
     if (params->n < 4)
         return "Number of points must be at least four";
@@ -661,7 +658,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
      */
     ret = NULL;
     {
-        char *sep;
+        const char *sep;
         char buf[80];
         int retlen;
         edge *ea;
@@ -736,7 +733,7 @@ static char *new_game_desc(const game_params *params, random_state *rs,
     return ret;
 }
 
-static char *validate_desc(const game_params *params, const char *desc)
+static const char *validate_desc(const game_params *params, const char *desc)
 {
     int a, b;
 
@@ -883,7 +880,7 @@ static void free_game(game_state *state)
 }
 
 static char *solve_game(const game_state *state, const game_state *currstate,
-                        const char *aux, char **error)
+                        const char *aux, const char **error)
 {
     int n = state->params.n;
     int matrix[4];
@@ -1126,14 +1123,14 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             ui->newpoint.x = x;
             ui->newpoint.y = y;
             ui->newpoint.d = ds->tilesize;
-            return "";
+            return UI_UPDATE;
         }
 
     } else if (IS_MOUSE_DRAG(button) && ui->dragpoint >= 0) {
         ui->newpoint.x = x;
         ui->newpoint.y = y;
         ui->newpoint.d = ds->tilesize;
-        return "";
+        return UI_UPDATE;
     } else if (IS_MOUSE_RELEASE(button) && ui->dragpoint >= 0) {
         int p = ui->dragpoint;
         char buf[80];
@@ -1148,7 +1145,7 @@ static char *interpret_move(const game_state *state, game_ui *ui,
             ui->newpoint.x >= (long)state->w*ui->newpoint.d ||
             ui->newpoint.y < 0 ||
             ui->newpoint.y >= (long)state->h*ui->newpoint.d)
-            return "";
+            return UI_UPDATE;
 
         /*
          * We aren't cancelling the drag. Construct a move string
diff --git a/apps/plugins/puzzles/src/windows.c b/apps/plugins/puzzles/src/windows.c
index ffd0f75894..8e5b40650d 100644
--- a/apps/plugins/puzzles/src/windows.c
+++ b/apps/plugins/puzzles/src/windows.c
@@ -150,7 +150,7 @@ void dputs(char *buf)
     OutputDebugString(buf);
 }
 
-void debug_printf(char *fmt, ...)
+void debug_printf(const char *fmt, ...)
 {
     char buf[4096];
     va_list ap;
@@ -258,7 +258,7 @@ void frontend_free(frontend *fe)
 static void update_type_menu_tick(frontend *fe);
 static void update_copy_menu_greying(frontend *fe);
 
-void fatal(char *fmt, ...)
+void fatal(const char *fmt, ...)
 {
     char buf[2048];
     va_list ap;
@@ -304,7 +304,7 @@ void get_random_seed(void **randseed, int *randseedsize)
     *randseedsize = sizeof(SYSTEMTIME);
 }
 
-static void win_status_bar(void *handle, char *text)
+static void win_status_bar(void *handle, const char *text)
 {
 #ifdef _WIN32_WCE
     TCHAR wText[255];
@@ -556,7 +556,8 @@ static void win_unclip(void *handle)
 }
 
 static void win_draw_text(void *handle, int x, int y, int fonttype,
-                          int fontsize, int align, int colour, char *text)
+                          int fontsize, int align, int colour,
+                          const char *text)
 {
     frontend *fe = (frontend *)handle;
     POINT xy;
@@ -1002,7 +1003,7 @@ void print(frontend *fe)
     document *doc;
     midend *nme = NULL;  /* non-interactive midend for bulk puzzle generation */
     int i;
-    char *err = NULL;
+    const char *err = NULL;
 
     /*
      * Create our document structure and fill it up with puzzles.
@@ -1550,7 +1551,7 @@ static frontend *frontend_new(HINSTANCE inst)
     return fe;
 }
 
-static void savefile_write(void *wctx, void *buf, int len)
+static void savefile_write(void *wctx, const void *buf, int len)
 {
     FILE *fp = (FILE *)wctx;
     fwrite(buf, 1, len, fp);
@@ -1586,7 +1587,7 @@ static midend *midend_for_new_game(frontend *fe, const game *cgame,
         midend_new_game(me);
     } else {
         FILE *fp;
-        char *err_param, *err_load;
+        const char *err_param, *err_load;
 
         /*
          * See if arg is a valid filename of a save game file.
@@ -2057,52 +2058,43 @@ static config_item *frontend_get_config(frontend *fe, int which,
 
         ret[i].name = "Number of puzzles to print";
         ret[i].type = C_STRING;
-        ret[i].sval = dupstr("1");
-        ret[i].ival = 0;
+        ret[i].u.string.sval = dupstr("1");
         i++;
 
         ret[i].name = "Number of puzzles across the page";
         ret[i].type = C_STRING;
-        ret[i].sval = dupstr("1");
-        ret[i].ival = 0;
+        ret[i].u.string.sval = dupstr("1");
         i++;
 
         ret[i].name = "Number of puzzles down the page";
         ret[i].type = C_STRING;
-        ret[i].sval = dupstr("1");
-        ret[i].ival = 0;
+        ret[i].u.string.sval = dupstr("1");
         i++;
 
         ret[i].name = "Percentage of standard size";
         ret[i].type = C_STRING;
-        ret[i].sval = dupstr("100.0");
-        ret[i].ival = 0;
+        ret[i].u.string.sval = dupstr("100.0");
         i++;
 
         ret[i].name = "Include currently shown puzzle";
         ret[i].type = C_BOOLEAN;
-        ret[i].sval = NULL;
-        ret[i].ival = TRUE;
+        ret[i].u.boolean.bval = TRUE;
         i++;
 
         ret[i].name = "Print solutions";
         ret[i].type = C_BOOLEAN;
-        ret[i].sval = NULL;
-        ret[i].ival = FALSE;
+        ret[i].u.boolean.bval = FALSE;
         i++;
 
         if (fe->game->can_print_in_colour) {
             ret[i].name = "Print in colour";
             ret[i].type = C_BOOLEAN;
-            ret[i].sval = NULL;
-            ret[i].ival = FALSE;
+            ret[i].u.boolean.bval = FALSE;
             i++;
         }
 
         ret[i].name = NULL;
         ret[i].type = C_END;
-        ret[i].sval = NULL;
-        ret[i].ival = 0;
         i++;
 
         return ret;
@@ -2112,22 +2104,24 @@ static config_item *frontend_get_config(frontend *fe, int which,
     }
 }
 
-static char *frontend_set_config(frontend *fe, int which, config_item *cfg)
+static const char *frontend_set_config(
+    frontend *fe, int which, config_item *cfg)
 {
     if (which < CFG_FRONTEND_SPECIFIC) {
         return midend_set_config(fe->me, which, cfg);
     } else if (which == CFG_PRINT) {
-        if ((fe->printcount = atoi(cfg[0].sval)) <= 0)
+        if ((fe->printcount = atoi(cfg[0].u.string.sval)) <= 0)
             return "Number of puzzles to print should be at least one";
-        if ((fe->printw = atoi(cfg[1].sval)) <= 0)
+        if ((fe->printw = atoi(cfg[1].u.string.sval)) <= 0)
             return "Number of puzzles across the page should be at least one";
-        if ((fe->printh = atoi(cfg[2].sval)) <= 0)
+        if ((fe->printh = atoi(cfg[2].u.string.sval)) <= 0)
             return "Number of puzzles down the page should be at least one";
-        if ((fe->printscale = (float)atof(cfg[3].sval)) <= 0)
+        if ((fe->printscale = (float)atof(cfg[3].u.string.sval)) <= 0)
             return "Print size should be positive";
-        fe->printcurr = cfg[4].ival;
-        fe->printsolns = cfg[5].ival;
-        fe->printcolour = fe->game->can_print_in_colour && cfg[6].ival;
+        fe->printcurr = cfg[4].u.boolean.bval;
+        fe->printsolns = cfg[5].u.boolean.bval;
+        fe->printcolour = fe->game->can_print_in_colour &&
+            cfg[6].u.boolean.bval;
         return NULL;
     } else {
         assert(!"We should never get here");
@@ -2140,7 +2134,7 @@ static char *frontend_set_config(frontend *fe, int which, config_item *cfg)
 /* Control coordinates should be specified in dialog units. */
 HWND mkctrl(frontend *fe, int x1, int x2, int y1, int y2,
             LPCTSTR wclass, int wstyle,
-            int exstyle, const char *wtext, int wid)
+            int exstyle, const char *wtext, INT_PTR wid)
 {
     RECT rc;
     TCHAR wwtext[256];
@@ -2191,7 +2185,7 @@ static void create_config_controls(frontend * fe)
             mkctrl(fe, col2l, col2r, y, y + 12,
                    TEXT("EDIT"), WS_BORDER | WS_TABSTOP | ES_AUTOHSCROLL,
                    0, "", (j->ctlid = id++));
-            SetDlgItemTextA(fe->cfgbox, j->ctlid, i->sval);
+            SetDlgItemTextA(fe->cfgbox, j->ctlid, i->u.string.sval);
             break;
 
           case C_BOOLEAN:
@@ -2201,7 +2195,7 @@ static void create_config_controls(frontend * fe)
             mkctrl(fe, col1l, col2r, y + 1, y + 11, TEXT("BUTTON"),
                    BS_NOTIFY | BS_AUTOCHECKBOX | WS_TABSTOP,
                    0, i->name, (j->ctlid = id++));
-            CheckDlgButton(fe->cfgbox, j->ctlid, (i->ival != 0));
+            CheckDlgButton(fe->cfgbox, j->ctlid, (i->u.boolean.bval != 0));
             break;
 
           case C_CHOICES:
@@ -2215,9 +2209,11 @@ static void create_config_controls(frontend * fe)
                          CBS_DROPDOWNLIST | CBS_HASSTRINGS,
                          0, "", (j->ctlid = id++));
             {
-                char c, *p, *q, *str;
+                char c;
+                const char *p, *q;
+                char *str;
 
-                p = i->sval;
+                p = i->u.choices.choicenames;
                 c = *p++;
                 while (*p) {
                     q = p;
@@ -2236,7 +2232,7 @@ static void create_config_controls(frontend * fe)
                     p = q;
                 }
             }
-            SendMessage(ctl, CB_SETCURSEL, i->ival, 0);
+            SendMessage(ctl, CB_SETCURSEL, i->u.choices.selected, 0);
             break;
         }
 
@@ -2282,7 +2278,8 @@ static int CALLBACK ConfigDlgProc(HWND hwnd, UINT msg,
          */
         if ((LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)) {
             if (LOWORD(wParam) == IDOK) {
-                char *err = frontend_set_config(fe, fe->cfg_which, fe->cfg);
+                const char *err = frontend_set_config(
+                    fe, fe->cfg_which, fe->cfg);
 
                 if (err) {
                     MessageBox(hwnd, err, "Validation error",
@@ -2324,16 +2321,16 @@ static int CALLBACK ConfigDlgProc(HWND hwnd, UINT msg,
             GetDlgItemText(fe->cfgbox, j->ctlid, buffer, lenof(buffer));
 #endif
             buffer[lenof(buffer)-1] = '\0';
-            sfree(i->sval);
-            i->sval = dupstr(buffer);
+            sfree(i->u.string.sval);
+            i->u.string.sval = dupstr(buffer);
         } else if (i->type == C_BOOLEAN && 
                    (HIWORD(wParam) == BN_CLICKED ||
                     HIWORD(wParam) == BN_DBLCLK)) {
-            i->ival = IsDlgButtonChecked(fe->cfgbox, j->ctlid);
+            i->u.boolean.bval = IsDlgButtonChecked(fe->cfgbox, j->ctlid);
         } else if (i->type == C_CHOICES &&
                    HIWORD(wParam) == CBN_SELCHANGE) {
-            i->ival = SendDlgItemMessage(fe->cfgbox, j->ctlid,
-                                         CB_GETCURSEL, 0, 0);
+            i->u.choices.selected = SendDlgItemMessage(fe->cfgbox, j->ctlid,
+                                                       CB_GETCURSEL, 0, 0);
         }
 
         return 0;
@@ -2349,7 +2346,7 @@ static int CALLBACK ConfigDlgProc(HWND hwnd, UINT msg,
 #ifndef _WIN32_WCE
 HWND mkctrl(frontend *fe, int x1, int x2, int y1, int y2,
             char *wclass, int wstyle,
-            int exstyle, const char *wtext, int wid)
+            int exstyle, const char *wtext, INT_PTR wid)
 {
     HWND ret;
     ret = CreateWindowEx(exstyle, wclass, wtext,
@@ -2683,7 +2680,7 @@ static int get_config(frontend *fe, int which)
             ctl = mkctrl(fe, col2l, col2r, y, y+height*3/2,
                          "EDIT", WS_TABSTOP | ES_AUTOHSCROLL,
                          WS_EX_CLIENTEDGE, "", (j->ctlid = id++));
-            SetWindowText(ctl, i->sval);
+            SetWindowText(ctl, i->u.string.sval);
             y += height*3/2;
             break;
 
@@ -2694,7 +2691,7 @@ static int get_config(frontend *fe, int which)
             mkctrl(fe, col1l, col2r, y, y+height, "BUTTON",
                    BS_NOTIFY | BS_AUTOCHECKBOX | WS_TABSTOP,
                    0, i->name, (j->ctlid = id++));
-            CheckDlgButton(fe->cfgbox, j->ctlid, (i->ival != 0));
+            CheckDlgButton(fe->cfgbox, j->ctlid, (i->u.boolean.bval != 0));
             y += height;
             break;
 
@@ -2709,10 +2706,12 @@ static int get_config(frontend *fe, int which)
                          CBS_DROPDOWNLIST | CBS_HASSTRINGS,
                          WS_EX_CLIENTEDGE, "", (j->ctlid = id++));
             {
-                char c, *p, *q, *str;
+                char c;
+                const char *p, *q;
+                char *str;
 
                 SendMessage(ctl, CB_RESETCONTENT, 0, 0);
-                p = i->sval;
+                p = i->u.choices.choicenames;
                 c = *p++;
                 while (*p) {
                     q = p;
@@ -2727,7 +2726,7 @@ static int get_config(frontend *fe, int which)
                 }
             }
 
-            SendMessage(ctl, CB_SETCURSEL, i->ival, 0);
+            SendMessage(ctl, CB_SETCURSEL, i->u.choices.selected, 0);
 
             y += height*3/2;
             break;
@@ -3019,7 +3018,7 @@ static LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
             break;
           case IDM_SOLVE:
             {
-                char *msg = midend_solve(fe->me);
+                const char *msg = midend_solve(fe->me);
                 if (msg)
                     MessageBox(hwnd, msg, "Unable to solve",
                                MB_ICONERROR | MB_OK);
@@ -3111,7 +3110,8 @@ static LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
                         fclose(fp);
                     } else {
                         FILE *fp = fopen(filename, "r");
-                        char *err = NULL;
+                        const char *err = NULL;
+                        char *err_w = NULL;
                         midend *me = fe->me;
 #ifdef COMBINED
                         char *id_name;
@@ -3139,7 +3139,8 @@ static LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
                                     "supported by this program";
                             } else {
                                 me = midend_for_new_game(fe, gamelist[i], NULL,
-                                                         FALSE, FALSE, &err);
+                                                         FALSE, FALSE, &err_w);
+                                err = err_w;
                                 rewind(fp); /* for the actual load */
                             }
                             sfree(id_name);
@@ -3152,6 +3153,7 @@ static LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
 
                         if (err) {
                             MessageBox(hwnd, err, "Error", MB_ICONERROR|MB_OK);
+                            sfree(err_w);
                             break;
                         }