chronic error with python on mac os/x 10.5

[Tzury Bar Yochay]

Although I am experiencing this problem using a specific domain
library (pjsip). Googling this issue show that it is happening to many
libraries in python on mac.

I was wondering whether anyone solved this or alike in the past and
might share what steps were taken.
Note: this python lib works fine on other platforms (posix, win, and
earlier versions of mac os x)

>>> import py_pjsua
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.5/
lib/python2.5/site-packages/py_pjsua.so, 2): Symbol not found:
___CFConstantStringClassReference
  Referenced from: /Library/Frameworks/Python.framework/Versions/2.5/
lib/python2.5/site-packages/py_pjsua.so
  Expected in: dynamic lookup