NOTICE:  This source code distribution contains source code contained
in the book "Programming OpenGL for the X Window System" (ISBN:
0-201-48359-9) published by Addison-Wesley.  The programs and
associated files contained in the distribution were developed by Mark
J. Kilgard and are Copyright 1994, 1995, 1996 by Mark J.  Kilgard
(unless otherwise noted).  The programs are not in the public domain,
but they are freely distributable without licensing fees.  These
programs are provided without guarantee or warranty expressed or
implied.