#include <stdio.h>
#include <math.h>
-#include GLUT_H
+#include <simgear/compiler.h>
+#if defined( __APPLE__)
+# include <OpenGL/OpenGL.h>
+# include <GLUT/glut.h>
+#else
+# include <GL/gl.h>
+# include <GL/glut.h>
+#endif
#define TEXRES_X 256
#define TEXRES_Y 256