This is game code of Rexuiz.
You need to have gmqcc installed. Use make command to build the mod.
make QCC=/path/to/gmqcc
Copy 1vs1.dat, menu.dat, 1vs1.cfg and cl_1vs1-*.pk3 to your ~/.rexuiz/data directory.
Add this line at beginning of server.cfg:
exec 1vs1.cfg
And these lines at beginning of autoexec.cfg:
exec 1vs1.cfg
exec config.cfg
Check out 1vs1.cfg for available cvars. Most of them are not documented very well, it's a work in progress.