collective.monkeypatch fails to detect Zope version (z3c.form)

Question

On some of our servers collective.monkeypatch does not work:

    Unable to detect Zope version. Please make sure you have Zope 2.10.4 or newer installed.
    2011-03-24 10:17:13 ERROR collective.monkeypatcher Could not patch because version not recognized. Wanted: [2, 13, 9], Installed: []
    2011-03-24 10:17:13 INFO collective.monkeypatcher Preconditions for patching scope <class 'z3c.form.form.BaseForm'> not met (Zope2-=2.13.999)!
    2011-03-24 10:17:13 ERROR collective.monkeypatcher Could not patch because version not recognized. Wanted: [2, 13, 9], Installed: []
    2011-03-24 10:17:13 INFO collective.monkeypatcher Preconditions for patching scope <class 'z3c.form.group.GroupForm'> not met (Zope2-=2.13.999)!

We have tried the some buildout on different computers and cannot come up with reliable pattern why it is failing (probably something egg and version pindown related)

What could be the issue and how to