-Makefile.X11 - "old" top-level Makefile for X11-based systems
-Make-config - system configurations used by the Makefile.X11
-configure - the GNU autoconf script
-bin/ - shell scripts for making shared libraries, etc
-include/ - GL header (include) files
-lib/ - client libraries, created during installation
-src/ - source code for the main libGL library
-si-glu/ - SGI Sample Implementation of libGLU
-src-glu/ - old source code for libGLU (obsolete)
-docs/ - documentation
-util/ - handly utility functions
-widgets-mesa/ - Mesa widgets for Xt/Motif (obsolete)
-widgets-sgi/ - SGI OpenGL widgets for Xt/Motif