1. You need a Common Lisp implementation.
   Only tested on SBCL right now.

2. Then link the huma4drl.asd file into your ~/.sbcl/systems directory:

   mkdir ~/.sbcl
   mkdir ~/.sbcl/systems
   ln -s ~/src/huma4drl/huma4drl.asd ~/.sbcl/systems

3. At the shell, cd to the the directory with this file, run SBCL, and
   then at the REPL, type:

    (require :huma4drl)
    (in-package :huma4drl)
    (output [dir])               ;; 'dir' is optional destination