QuakeGX MOD is a port of Quake for the Wii with extra modifications.
Original source can be found at https://code.google.com/archive/p/quake-gamecube/source/default/source
To begin compilation, run make in the root directory of the repository. This will produce the binary, named QuakeGX.dol in the root repository directory.
To run the resulting executable on a real Wii, copy the QuakeGX.dol file to quake/boot.dol, then copy PAK0.PAK from the shareware version of Quake and any other .pak files you may have into quake/ID1 and copy the quake folder to your apps folder on your SD card or USB.