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diff --git a/src/r_sky.c b/src/r_sky.c
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+/* Emacs style mode select   -*- C++ -*-
+ *-----------------------------------------------------------------------------
+ *
+ *
+ *  PrBoom: a Doom port merged with LxDoom and LSDLDoom
+ *  based on BOOM, a modified and improved DOOM engine
+ *  Copyright (C) 1999 by
+ *  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
+ *  Copyright (C) 1999-2000 by
+ *  Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
+ *  Copyright 2005, 2006 by
+ *  Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ *  02111-1307, USA.
+ *
+ * DESCRIPTION:
+ *  Sky rendering. The DOOM sky is a texture map like any
+ *  wall, wrapping around. A 1024 columns equal 360 degrees.
+ *  The default sky map is 256 columns and repeats 4 times
+ *  on a 320 screen?
+ *
+ *-----------------------------------------------------------------------------*/
+
+#ifdef __GNUG__
+#pragma implementation "r_sky.h"
+#endif
+#include "r_sky.h"
+
+//
+// sky mapping
+//
+int skyflatnum;
+int skytexture;
+int skytexturemid;
+
+//
+// R_InitSkyMap
+// Called whenever the view size changes.
+//
+void R_InitSkyMap (void)
+{
+  skytexturemid = 100*FRACUNIT;
+}