This is a very brief readme, but it will hopefully help you somewhat.
Get remar2d and retro $ git clone git://github.com/remar/remar2d.git $ git clone git://github.com/remar/retro.git
Make remar2d $ cd remar2d/src $ make
Make retro $ cd ../../retro/src $ make
If you don't have SDL_Mixer you can compile without sound by doing two simple things:
Email to the original author can be sent to: andreas.remar@gmail.com.
Daniel Remar: Original game idea Graphics GameMaker implementation
Andreas Remar: Linux implementation
Nint€ndo: Sfx
The Linux implementation of Retrobattle is licensed under the GPL (General Public License).