A projects which using ez_setup in its setup.py as described in: http://peak.telecommunity.com/DevCenter/setuptools#id23 ...seems not to play nicely with zc.buildout. To reproduce make an empty directory and download ez_setup.py and bootstrap.py into it: http://peak.telecommunity.com/dist/ez_setup.py http://svn.zope.org/*checkout*/zc.buildout/trunk/bootstrap/bootstrap.py Then make an empty setup.py:: #!/usr/bin/env python import ez_setup ez_setup.use_setuptools() from setuptools import setup setup(name='foo') Make an empty buildout.cfg:: [buildout] develop = . Then bootstrap buildout:: $ python bootstrap.py -v Finally run buildout. Note that an error occurs importing ez_setup:: $ bin/buildout -v Installing 'zc.buildout', 'setuptools'. We have the best distribution that satisfies 'zc.buildout'. Picked: zc.buildout = 1.0.0b30 We have the best distribution that satisfies 'setuptools'. Picked: setuptools = 0.6c7 Develop: '/tmp/foo/.' Traceback (most recent call last): File "/tmp/tmpsDYTIA", line 10, in ? execfile('/tmp/foo/./setup.py') File "/tmp/foo/./setup.py", line 2, in ? import ez_setup ImportError: No module named ez_setup While: Installing. Processing develop directory '/tmp/foo/.'. An internal error occured due to a bug in either zc.buildout or in a recipe being used: AssertionError: Should I post this report anywhere else? Ross