On Fri, 6 Jul 2001, Rick Kelly wrote:
> Xlib: extension "GLX" missing on display ":0.0"
> gears: ":0.0" does not support the GLX extension

Try adding the following to the "Module" section in XF86Config:

 Load "glx"
 (you might also need to load GLcore, I'm not sure as I use XFree86 3.3.6)

Cheers,
Jared