I've attached a patch that should fix this issue and allow roundup as an
egg using easy_install, zc.buildout, etc.

1. The patch creates a subclass of
"distutils.command.install_lib.install_lib" command class and overrides
the default one through setup.py

2. Modification of "roundup.dist.command.build" wasn't necessary, but
was done to comply with DRY. I can submit a new patch to avoid this if
required.