Hey, I use Python 2.7 (Fedora 16). However zc.buildout (1.5.2) does not work for me: $ buildout init Creating '/home/fs/temp/buildout.cfg'. Creating directory '/home/fs/temp/bin'. Creating directory '/home/fs/temp/parts'. Creating directory '/home/fs/temp/eggs'. Creating directory '/home/fs/temp/develop-eggs'. Getting distribution for 'distribute'. Traceback (most recent call last): ... add_activation_listener(lambda dist: dist.activate()) File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2230, in activate map(declare_namespace, self._get_metadata('namespace_packages.txt')) File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 1815, in declare_namespace path = sys.modules[parent].__path__ KeyError: 'peak' An error occurred when trying to install distribute 0.6.25. Look above this message for any errors that were output by easy_install. While: Bootstrapping. Getting distribution for 'distribute'. Error: Couldn't install: distribute 0.6.25 The code which causes the exception is: def declare_namespace(packageName): ... if '.' in packageName: parent = '.'.join(packageName.split('.')[:-1]) declare_namespace(parent) if parent not in _namespace_packages: __import__(parent) try: path = sys.modules[parent].__path__ except AttributeError: raise TypeError("Not a package:", parent) The package which triggers the bug is 'decoratortools' (python package 'peak.utils'). If I install other namespace packages (e.g. zope.interface) everything works fine. The error happens because 'peak' is not in sys.modules when buildout calls it's easy_install implementation. If I add some code to ignore the keyerror, everything works as expected though I'm not sure that this is the right fix. Any idea how I can fix this? Pointers welcome. fs