$ hellanzb.py -D
Traceback (most recent call last):
  File "/usr/local/bin/hellanzb.py", line 14, in <module>
    from Hellanzb.Core import main
  File "/usr/local/lib/python2.5/site-packages/Hellanzb/Core.py", line 9, in <module>
    from Hellanzb.HellaReactor import HellaReactor
  File "/usr/local/lib/python2.5/site-packages/Hellanzb/HellaReactor.py", line 11, in <module>
    import twisted.copyright
  File "/usr/local/lib/python2.5/site-packages/twisted/__init__.py", line 22, in <module>
    raise ImportError("you need zope.interface installed "
ImportError: you need zope.interface installed (http://zope.org/Products/ZopeInterface/)

$ pkg_info |grep zope
py25-zopeInterface-3.3.0.1 Zope.interface package from Zope 3