Gentoo's Bugzilla –
Attachment 592136 Details for
Bug 696982dev-python/astor-0.7.1 with =dev-python/setuptools-41.4.0 - setup.py: File "/usr/lib64/python2.7/site-packages/setuptools/_vendor/packaging/specifiers.py", line 594, in __init__: AttributeError: 'SpecifierSet' object has no attribute 'split'