I'm not sure you can alter this https://github.com/technomancy/leiningen/blob/2.9.8/leiningen-core/project.clj#L7

https://github.com/technomancy/leiningen/blob/2.9.8/bin/leinhttps://github.com/technomancy/leiningen/blob/2.9.8/bin/leinthis script calculates the classpath for the binary in a few ways. I'm a quick check I don't see a way still though. But perhaps there is something you could do there.