installing zope with pip requires upgrading zope.interface version

[Jeffrey Finkelstein]

Zope2 version 2.13.12 on Ubuntu 11.10.

To reproduce:

    virtualenv env
    . env/bin/activate
    pip install Zope2
    mkzopeinterface foo

At this point, we get the following traceback:

Traceback (most recent call last):
  File "/mnt/data/src/kajiaso/testenv/bin/mkzopeinstance", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/mnt/data/src/kajiaso/testenv/local/lib/python2.7/site-packages/distribute-0.6.19-py2.7.egg/pkg_resources.py", line 2713, in <module>
    parse_requirements(__requires__), Environment()
  File "/mnt/data/src/kajiaso/testenv/local/lib/python2.7/site-packages/distribute-0.6.19-py2.7.egg/pkg_resources.py", line 588, in resolve
    raise VersionConflict(dist,req) # XXX put more info here
pkg_resources.VersionConflict: (zope.interface 3.6.1 (/usr/lib/python2.7/dist-packages), Requirement.parse('zope.interface>=3.8.0'))

As a workaround, just do

    pip install zope.interface --upgrade

[Hanno Schlichting (hannosch)]

Installing Zope2 via pip without using a known-good-set of versions isn't supported. Please see http://docs.zope.org/zope2/releases/2.13/INSTALL.html for valid installation instructions and note the use of a custom index for easy_install. Something similar might work for pip, though they have been reports in the past of some Zope packages being incompatible with pip.

[sureshvv (sureshvv)]

tseaver has some advice here:

https://github.com/zopefoundation/zope.pagetemplate/issues/1