Add missing file opengl.h.

diff --git a/opengl.h b/opengl.h
new file mode 100644 (file)
index 0000000..34079b7
--- /dev/null
+++ b/opengl.h
@@ -0,0 +1,11 @@
+#ifndef _OPENGL_H
+#define _OPENGL_H 1
+
+// A common place to find OpenGL includes, if your system should have them in weird places.
+
+#define GL_GLEXT_PROTOTYPES 1
+
+#include <GL/gl.h>
+#include <GL/glext.h>
+
+#endif  // !defined(_OPENGL_H)