The Python build on Tiger is broken, it does not include the header
file.  David, you probably did an upgrade install, or have other
modifications made at some point that provided the header.  The fix is
at http://undefined.org/python/#TigerPython24Fix -- notice Bob's note,
"due to Tiger header regressions".  I don't think you need to install
2.4.1 in order to use the fix, though.  IIRC, I used it once I
upgraded, and I've built extensions since then.  Durus in particular.

You may want to redirect this inquiry to the python-mac sig mailing
list, or just get Bob Ippolito's attention.  They'll know the details
better than I.

---Peter Herndon