Comment 4 for bug 563060

zope.interface was only an example of a package (there are many of them) that declares a dependency on setuptools (in egg-info/requires.txt) but only has python-pkg-resources dependency.

The purpose of the splitted python-pkg-resources package was to be used as a runtime dependency for exactly this purpose. But now this does not work. So this a regression of python-pkg-resources (distribute).

Also, sorry, python-support or python-central doesn't make a difference after all.