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Thanks for the pointer.

I have downloaded the current CVS and it builds without the 
errors for '-Kpthread'. (It still fails to build the 
_curses extension by the way).

When I ran 'make test' it failed in test_descr.py [see 
attached file test.txt for output].

I then manually ran the following tests:
test_thread.py
test_threaded_import.py
test_threaded_tempfile.py
test_threading.py

and these all succeeded.