Mods should be placed in the MobileForces folder to be able to be compiled, in the case of ZombieMode, run this from the System folder in MobileForces
rm ZombieGame.u; wine ucc make
Then to start the game with it run a command like this
wine MobileForces.exe mf-polar?game=ZombieGame.ZombieGame?mutator=mutPack.AddWeaps
Or combine both in a single command for rapid testing like
rm ZombieGame.u; wine ucc make && wine MobileForces.exe mf-polar?game=ZombieGame.ZombieGame?mutator=mutPack.AddWeaps
To compile packages from these folder, you need to add the following in the [Editor.EditorEngine] section in your MobileForces.ini
EditPackages=ZombieGame