I've added Linux support to Quake2VR. You can download pre-compiled binaries here: http://www.jspenguin.org/software/quake2vr/
or you can clone and compile it yourself from source: https://github.com/jspenguin/quake2vr/
If you compile from source, you will still need the support files from the binary release, as well as libovr.so. You can use the one I included or the one that the SDK Makefile generates (just rename it from libovr.so.0.1.1 to libovr.so).
Currently, only the base game is supported, but if anyone wants it I can work on porting the mission pack.