[Zope] Zope version

Where does Zope get its version information? Under Control Panel I see:- Zope Version (unreleased version, python 2.3.4, os2emx) Python Version 2.3.4 (#0, Jun 6 2004, 13:10:27) [EMX GCC 2.8.1] System Platform os2emx Zope seems unable to retrieve its version number. I know it is v2.7.2 as I've just built it. -- John