You probably don't care about the code in this repo. Most of jjjj's code is in https://github.com/rweichler/jjjj
Anyway, this is all the C/objc stuff.
If to build this, just compile all of the files in src/objc/ somehow, then stick that in your /Applications/jjjj.app directory.
You can also try using aite, which is my build system.
Just run these commands (need to be on a Mac, with LuaJIT and ldid installed):
git clone --recursive https://github.com/rweichler/jjjj-core
git clone https://github.com/rweichler/aite
cd jjjj-core
../aite/main.lua
And it should make jjjj.deb.