[Zope] Error starting Zope

[Blue, Neil]

Hello,

I have now installed Python 1.5.2 and Zope 2.3.1, however when I try to
start Zope I get the following error:

 Built-in exception class not found: EnvironmentError.  Library mismatch?
Warning!  Falling back to string-based exceptions
Traceback (innermost last):
  File "/home/sites/home/users/admin/Zope-2.3.1-src/z2.py", line 542, in ?
    import ZServer
  File "/home/sites/home/users/admin/Zope-2.3.1-src/ZServer/__init__.py",
line 87, in ?
    from medusa import max_sockets, asyncore
  File
"/home/sites/home/users/admin/Zope-2.3.1-src/ZServer/medusa/asyncore.py",
line 466, in ?
    import FCNTL
ImportError: No module named FCNTL

Unfortuneatley I don't have a clue what all this means, but I guess there is
a module missing. Please could anyone help with this.

Thank you
Neil Blue