Omer Zak wrote:

However it aborts with the error message:
Xlib:  extension "XFree86-DRI" missing on display ":0.0".

This indeed means that your X server doesn't provide OpenGL services via the standard means (DRI). Since you have an NVidia card, there's no standard (DRI) support for your card so you have to use NVidia's closed-source drivers anyway.

According to
http://linux.derkeiler.com/Mailing-Lists/Debian/2004-10/0232.html (which
I found by googling), the problem is that I have to use nVidia-provided
libGL.so.1.2 rather than the library provided by xlibmesa-gl (Version:
4.3.0.dfsg.1-14sarge1).

Either manually install NVidia's driver (that is, their kernel driver, and nvidia-glx, which includes an X server driver and a custom libGL for the applications) or install the Debian packages nvidia-kernel-source and nvidia-glx.

Another option is to modify the application's source code and/or build
process (the application is GPLed and I have its source code).

No reason to do it. You'd be better by having just one libGL.so on your system, linking to the libGL.so.whatever that actually works with your hardware.

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