>     http://code.google.com/p/inferno-os/source/browse/#hg/appl/cmd/mash

that one is indeed fairly old, much as we received it, except for
changes to fit any changes in the environment, but

http://www.vitanuova.com/inferno/man/1/mash.html
	and
http://www.vitanuova.com/inferno/man/1/mash-make.html

gives you some idea, especially the latter, in this context.