Cython and PyCharm - error which does not occur in Python from Terminal

Hi everyone, I have a very weird error during import of a compiled cython function. I say weird because everything works just fine if I use python from Terminal instead of Pycharm console. Here is the error:

Traceback (most recent call last):
 File "<input>", line 1, in <module>
 File "/Applications/PyCharm CE.app/Contents/helpers/pydev/pydev_import_hook.py", line 21, in do_import
 module = self._system_import(name, *args, **kwargs)
 File "/Users/(me)/Analysis/analysis.py", line 8, in <module>
 from cfunctions import Cpotts_energy
 File "/Applications/PyCharm CE.app/Contents/helpers/pydev/pydev_import_hook.py", line 21, in do_import
 module = self._system_import(name, *args, **kwargs)
ImportError: dlopen(/Users/(me)/Analysis/cfunctions.so, 2): Symbol not found: _PyCapsule_New
 Referenced from: /Users/(me)/Analysis/cfunctions.so
 Expected in: flat namespace
 in /Users/(me)/Analysis/cfunctions.so

The C function is just an easy array sum, but as I said no errors occur using python from Terminal, so I guess PyCharm itself might be involved in some obscure setup that exceeds from my newbie knowledge.

Mac OS 10.11.1, Python 2.7.3

Any clues? Thanks in advice

Lorenzo