[Calendarserver-maintainers] Bug#529210: calendarserver: dependencies problem

[Ryan Hass]

Additional information about this bug can be found in Ubuntu Launchpad
bug 349837.
https://bugs.launchpad.net/ubuntu/+source/twisted-calendarserver/+bug/349837

They are reporting the same issue.

The issue is appears to be with twisted-calendarserver in which is is
attempting to overwrite portions of python-twisted-core with it's own
patched variant.