A simple OpenGL and Tk interface used for the OpenGL tutorial in

  http://www.eecs.tulane.edu/www/Terry/OpenGL/Introduction.html

Other than changing "-lMesatk" to "-lgltk" and "#include <gltk.h>" to
"#include <GL/gltk.h>", everything should work as described on that page.

- Satoshi
asami@FreeBSD.org