all the sources to the QNX 3rd repository are available on the 3rd party CD. You can download and take a look at the patched python 2.2.2 source and how it compiled.
I think cdm was the one who did the python on the CD so he may be able to help you out.
Right now our libs have a limitation where fork() fails if there have been any threads created. So python configured with threads on QNX cannot ever start any processes.