--- include/GL/glut.h.orig	Sun Nov  9 02:16:28 2008
+++ include/GL/glut.h	Sun Nov  9 02:17:23 2008
@@ -60,7 +60,9 @@ typedef unsigned short wchar_t;
 
 /* define APIENTRY and CALLBACK to null string if we aren't on Win32 */
 #if !defined(_WIN32)
+#ifndef APIENTRY
 #define APIENTRY
+#endif
 #define GLUT_APIENTRY_DEFINED
 #define CALLBACK
 #endif