*/
#include <simgear/compiler.h>
-#if !defined( _WIN32 ) && !defined( __MACH__ )
-# include <X11/Xlib.h>
+#include <osg/GL>
+
+#if defined( __APPLE__)
+# include <OpenGL/OpenGL.h>
#endif
-#include SG_GL_H
-#ifndef _WIN32
-# include SG_GLX_H
+
+#if !defined( _WIN32 ) && !defined( __APPLE__ )
+# include <X11/Xlib.h>
+# include <GL/glx.h>
#endif
#include <string>