# include <X11/Xlib.h>
#endif
#include SG_GL_H
+#if defined( __MACH__)
+# include <OpenGL/OpenGL.h>
+#endif
#ifndef _WIN32
# include SG_GLX_H
#endif
-#ifdef __MACH__
-# ifndef None
-# define None false
-# endif
-# ifndef True
-# define True true
-# endif
-#endif
#include <string>
#include <vector>