If the 3D-enabled X server is not listening on display :0, then you need
to set the VGL_DISPLAY environment variable to whatever display it is
listening on, e.g.:

  export VGL_DISPLAY=:1

Or you can simply pass this to vglrun, e.g.

  vglrun -d :1 {your app}

Jose Rodriguez wrote:
> Hello.
> 
> I have the same problem that somebody on this list had some months
> ago. Specifically, when I try to run a 3D application with vglrun, it
> complains about missing the "GLX" extension. From the logs and
> comments posted in that past thread I believe that VNC is running as X
> display :0, and that I have to make sure that instead I have an X
> server with 3D capabilities running on :0, and a VNC session in
> another display. I can fire up a 'real' X server (with 3D) if I do it
> locally on the machine I'm using as a server, but I guess this is not
> what I have to do--and it doesn't help me much, in any case.
> 
> I would appreciate any help you could provide.
> 
> Regards
> 
> Jose
> 
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