pantsbuild/pants — pull request #182 by jsirois (2014-06-03 17:21:07+00:00)
Title: Add a hook to allow pants customizations to inject backends.

This may be provisional until the backend reorg finalizes, but
for now it assumes the additional backend packages injected
have been arranged to be on the PYTHONPATH by other means.

https://rbcommons.com/s/twitter/r/447/