Some package (sys-cluster/cinder) fails with this backtrace: 2016-01-31 03:49:54.320 7521 ERROR cinder.volume.api plugin = ep.resolve() 2016-01-31 03:49:54.320 7521 ERROR cinder.volume.api File "/usr/lib64/python2.7/site-packages/pkg_resources/__init__.py", line 2376, in resolve 2016-01-31 03:49:54.320 7521 ERROR cinder.volume.api module = __import__(self.module_name, fromlist=['__name__'], level=0) 2016-01-31 03:49:54.320 7521 ERROR cinder.volume.api File "/usr/lib64/python2.7/site-packages/taskflow/engines/action_engine/engine.py", line 22, in <module> 2016-01-31 03:49:54.320 7521 ERROR cinder.volume.api from automaton import runners 2016-01-31 03:49:54.320 7521 ERROR cinder.volume.api ImportError: No module named automaton And inedeed, in /usr/lib64/python2.7/site-packages/taskflow/engines/action_engine/engine.py there is an import of automaton ("from automaton import runners"). So I think taskflow should depend on dev-python/automaton
fixed, removed the bad version, the stable one worked though... so use that