[GtkGLExt] Double Buffered Visual

["Murali Dhanakoti" <forums answers gmail com>]

Hi,

I built and installed gtkglextmm-1.2.0 from sources in
ubuntu linux. When I attempt to run the program called 'colors'  in the
example directory I get the following error message

OpenGL extension version - 
1.3
*** Cannot find the double-buffered visual.
*** Trying single-buffered visual.
*** No appropriate OpenGL-capable visual found.

All
the other example programs run just fine. Can somebody tell me what is
wrong with my OpenGL install. I have this 6200SE nvida graphics card.
If a glxinfo output would help you guys to diagnose the problem better
please let me know which part of the glxinfo would be useful and I will
post it here.

-- 
Thanks,
Murali