For the git clone route, you need to do a
git clone --recursive https://github.com/alito/mamele_pippable
since mamele_pippable is an attempt at a pip-friendly version of mamele (ie https://github.com/alito/mamele ), and it just points to that as a submodule.
Doing a direct:
pip install -v git+https://github.com/alito/mamele_pippable.git
should also work and is easier.
Whichever way you go, use the -v option for pip because pip swallows all output otherwise, and there might be some important output (compilation errors, etc) and a note about where to put or link the roms (basically: ~/.le/roms)
I should really just get this nicely packaged up and well documented, sorry. Half of the issue is fighting with pip and PyPI to get them to do what one wants.