Building complex projects 1 / 2

Compiling complex projects can be tedious.
        Makefiles are OK but don't play nice with the REPL
FFI needs to be compiled but sometimes having it available at a REPL is so nice
The system egg allows the best of both worlds
           (define-system xyz
                (file "z")
                (scheme-file "y" includes: '("z"))
                (compiled-scheme-file "x" depends: '("y")))
Special commands in csi:
,cs compile-system
,ls load-system
,sys change current system