1 files changed, 2 insertions, 1 deletions

diff --git a/tools/configure b/tools/configure
index 186e0d5ace..27609ca13a 100755
--- a/tools/configure
+++ b/tools/configure
@@ -165,7 +165,8 @@ simcc () {
         exit 2
     else 
         # generic sdl-config checker
-        GCCOPTS="$GCCOPTS `$sdl --cflags`"
+        #ignore the -D_GNU_SOURCE=1 inserted by sdl
+        GCCOPTS="$GCCOPTS `$sdl --cflags` -U_GNU_SOURCE"
         LDOPTS="$LDOPTS `$sdl --libs`"
     fi
  fi