[mod_python] Apache 1.3.12, Python 1.6, mod_python 2.5 not playing well together

Hello,

I've got Apache 1.3.12, Python 1.6, and mod_python 2.5.  I can compile
mod_python just fine, and have configured Apache and created an mptest.py
as the Installation documentation says.  However, when I try to access
it, I get the following error:

Mod_python error: "PythonHandler mptest"

Traceback (most recent call last):

  File "/usr/local/lib/python1.6/site-packages/mod_python/apache.py", line 135,
    in Dispatch module = import_module(module_name, req)

  File "/usr/local/lib/python1.6/site-packages/mod_python/apache.py", line 276,
    in import_module module = __import__(module_name)

ImportError: No module named mptest

I've checked the ML archives, and saw a message by Jeremy Hylton that was
almost exactly the problem I've encountered, but he was using mod_python
2.0, not 2.5.

Can someone give me some additional suggestions of what to try next?

Thanks,
Jeff