Leiningen's package management is built upon Maven's package management. This means that you can add artifacts directly to your local maven repo (typically loca

Leiningen's package management is built upon Maven's package management. This means that you can add artifacts directly to your local maven repo (typically located at ~/.m2) to have them used instead. I do this frequently by checking out a project and running `mvn install` or (if it's already a Leiningen-based project) `lein install`.