Comment 6 for bug 1277495

Actually, this could very well be pbr's fault after all, but I don't think it's related to the pbr 0.6 release specifically. In a bare virtualenv with python 3.3 and pip 1.4.1 I can upgrade setuptools to 2.1.2 with no problem.

Though I also can't seem to recreate this installing the requirements and test-requirements for python-cinderclient into a py33 venv either...