title: collective.monkeypatch fails to detect Zope version (z3c.form)
body: <p>On some of our servers collective.monkeypatch does not work:</p>
  
  <pre><code>    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 &lt;class 'z3c.form.form.BaseForm'&gt; 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 &lt;class 'z3c.form.group.GroupForm'&gt; not met (Zope2-=2.13.999)!
  </code></pre>
  
  <p>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)</p>
  
  <p>What could be the issue and how to</p>