GLX extensions for NVidia driver

The nvidia drivers work for the most part but when I try to run glxinfo 
it complains that the GLX module isn't available or something along 
those lines. I'm not sure how to get more information on this although I 
can get an exact copy of the error message from glxinfo if one is 
needed. As far as I know this should only be a problem as far as 3d 
games and software is concerned.