Difficulty running unit test that calls a module with cython

I have a miniconda setup where I am developing code that uses a library containing some cython. We use the source code of the library because we had to modify a few things, but we haven't touched the cython part.  My collaborator has things running in a Pycharm environment on linux with no problem. I am trying to set up the same situation on my Mac (Maverick). At first when I had just the Pycharm CE, the editor showed an error on the import statements where the imported file had the .pyx extension. Once I got a professional subscription, that was fixed, so now the editor shows no error on those import statements. But when I try to run the unit test, I am still getting the error.

 ImportError: cannot import name 'mle_trev'

What else can I try?