added a buch of

#ifdef __APPLE__
#include <OpenGL/gl.h>
#else
#include <GL/gl.h>
#endif
(also for <GL/glu.h>)

so that people don't have to create symlinks in
/System/Library/Frameworks/OpenGL.framework on Mac OS X
(Charles Wardlaw)

source/gameengine/GamePlayer/common/GPC_PolygonMaterial.cpp

@@ -67,8 +67,13 @@
 #ifdef WIN32
 #include <windows.h>
 #endif // WIN32
-#include "GL/gl.h"
-#include "GL/glu.h"
+#ifdef __APPLE__
+#include <OpenGL/gl.h>
+#include <OpenGL/glu.h>
+#else
+#include <GL/gl.h>
+#include <GL/glu.h>
+#endif
 
 static Image *fCurpage=0;
 static int fCurtile=0, fCurmode=0, fCurTileXRep=0, fCurTileYRep=0;

source/gameengine/GamePlayer/common/GPC_RenderTools.cpp

@@ -39,7 +39,11 @@
 #include <windows.h>
 #endif 
 
+#ifdef __APPLE__
+#include <OpenGL/gl.h>
+#else
 #include <GL/gl.h>
+#endif
 #include <iostream>
 
 #include "GPC_RenderTools.h"