Overlay with testing stuff
You may be insterested in following:
dev-lang/leiningen-bin -- Leiningen with bundled clojure, it just works, nothing more ;-)
dev-util/androgenizer -- should work, but I have not tested it for a long time
To install my ebuild generators, use ebuilds from the main tree, for instructions see https://github.com/jauhien/g-sorcery.