Xlib errors

[Pollywog <croak@shadypond.com>]

When I stop an X session, I find errors on the console that look like this:

Xlib:  extension "GLX" missing on display ":0.0".

I ran glxinfo and I get this:

lilypad:/home/pollywog#glxinfo
name of display: :0.0
Xlib:  extension "GLX" missing on display ":0.0".
Xlib:  extension "GLX" missing on display ":0.0".
Xlib:  extension "GLX" missing on display ":0.0".
Error: couldn't find RGB GLX visual

   visual  x  bf lv rg d st colorbuffer ax dp st accumbuffer  ms  cav
 id dep cl sp sz l  ci b ro  r  g  b  a bf th cl  r  g  b  a ns b eat
----------------------------------------------------------------------
Xlib:  extension "GLX" missing on display ":0.0".
Xlib:  extension "GLX" missing on display ":0.0".
0x22 16 tc  0  0  0 c  .  .  0  0  0  0  0  0  0  0  0  0  0  0 0 None


What needs to be done to correct this?

thanks