Hmmmmm........

I downloaded every version available from Sourceforge and none of them contained errno.py, as far as I could tell.

The start of the problem was trying to import telnetlib.py within a STAF/STAX project.  That complains because of missing select.py.  It was pointed out to me that is a known issue with the version of Jython that STAX uses:

http://osdir.com/ml/lang.jython.user/2003-02/msg00025.html 
http://aspn.activestate.com/ASPN/Mail/Message/Jython-dev/1887441

Eventually, I located select.py in a later version of Jython.  However, when I attempted to use that, then import failed again due to lack of errno.py.

Thanks for your response.

- David