"David Scriven" wrote in message news:[email protected] > >I am trying to run a program on fc6 that uses OpenGL and > >Freeglut and am receiving the following error message: > > > > freeglut (./cube): OpenGL GLX extension not supported by display ':1.0' > > > >My machine is rather old and has an ATI Rage-II (?) video > >card and xorg.conf says it is using the "ati" driver. > >However, if I point the display to a Windows-2k machine > >running the same hardware with Cygwin X, the program > >runs and displays the expected image. > > Check the xorg.conf in the "Module" section > there should be a line: > Load "glx" > if it's not there then insert it. > > If it is there look at /var/log/Xorg.0.log to see if there are any > error messages when it tries to load it > > Installing glxutils and running glxinfo will also help you > determine what is going on. Thanks for that helpful info, I think I understand the "why" now, but still not the solution. Turns out that I am working in a VNC display. When the program displays to the machine's console X server it runs fine. But when it tries to display to the VNC x server it produces the error. Doing some searching did not turn up any clear (at least to me) answers. I gather VNC doesn't support the glx extensions. I came across xf4vnc but that seems to be old and based on xfree86 and its not at all clear to me if it will work with fc6/xorg. Has anyone else been down this path and have any advice? Is it possible to have an OpenGL produce output in a VNC display?