Explanation/documentation of leiningen's defproject macro

Question

Leiningen's defproject macro is an important part of Clojure projects. However, information/documentation about it seems to be very sparse.

What are all of the options that defproject supports, and what are they used for?

Answer 1

AFAIK the sample project.clj shows all the available configuration options, all with a usage description.

Answer 2

A good place to get the information when the documentation is in the source code of the defproject macro.