To compile the game you must have SDL and SDL_mixer (see http://libsdl.org/ ).
Download the data and the source. Decompress its in the same directory and type:
# ./configure
# make
After the make the setup program is run for configure the game and addon.
You can see the addon page for download more fun options.
New: Download the Debian package:
The Debian package are a work of Christian T. Steigies <cts debian.org>
You can't add addon with this version, addon must to compil again the programs.