First, edit main.lisp so that you can load
Quicklisp,
Swank,
and the IMCL systems.
Then you can build IMCL, set it up to load the main.lisp file, and
run the imcl executable:
$ cmake .
$ make
$ cd bin
$ ln -s ../main.lisp .
$ ln -s ../lisplogo_alien_256.png .
$ ./imclIf you got it working, congratulations! It's still a very immature project, and there is much to be done. Why not improve it a bit and submit a pull request?
MIT