Compiling the Lsystem compiler is easy. You need make and OCaml installed, then...
$ cd Lsystem-Compiler
$ make
$ cp _build/lsystem /usr/bin
Compiling an Lsystem program is easy. You need the Java compiler installed, then...
$ lsystem -c foo.ls
Running an Lsystem program is easy too. You need Java installed, then...
$ java foo
Note that these gists have a .py extension. This is merely to add some syntax highlighting. The Lsystem compiler requires the .ls file extension, NOT the .py extension.