Standard Library Extensions
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OpenGL Utility Library (glu) provides support
do performing lower-level OpenGL function.
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E.g., standard matrix transforms,
polygon tessalation
and rendering surfaces.
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OpenGL Extension to the X Window System (glX) provides
a means of creating an OpenGL context and drawing windows
on the X Window System.
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OpenGL Utility Toolkit (glut) provides
basic GUI support that is independent of
any windowing system.
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Here is the
online manual from Kilgard (at SGI).
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The header files for these libraries
are included using the directive
where you may substitute gl, glu or glX
for glut. Note that glut automatically
includes the others.