After unpacking you'll have these files and directories (among others):
</p>
<pre>
-Makefile - top-level Makefile for most systems
-configs/ - makefile parameter files for various systems
+autogen.sh - Autoconf script for *nix systems
+scons/ - SCons script for Windows builds
include/ - GL header (include) files
bin/ - shell scripts for making shared libraries, etc
docs/ - documentation