Undefined symbol errors upon import of an extension I made.

[noobermin]

An extension I used uses some other functions i made (outside of the sources used by the extension itself), but it complains about them upon import as being undefined symbols.

>>> import libpytwo2gam 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: ./libpytwo2gam.so: undefined symbol: twoll_linearsearch
>>>

twoll_linearsea rch() is a function in an object file I include in the extra_objects member of the Extension object I make in the setup.py script. Here's the script:

from distutils.core import setup, Extension

ARCH = 'x86_64'

extra = ['../../../misc/ll/'+ARCH+'_tmp/ll.o',
         '../../simple/'+ARCH+'_tmp/srctools.o',
         '../'+ARCH+'_tmp/util.o',
         '../'+ARCH+'_tmp/extern.o']
print extra

two2gam_module = Extension('libpytwo2gam',
                           sources=['pyext.c'],
                           extra_objects = extra,
                           libraries=['SDL', 'SDL_image'])

setup(name = 'libpytwo2gam',
       version = '0.0.1',
       description = 'Python Interface for two2gam',
       author = '{2}rIng',
       author_email = 'xxx@xxx.com',
       long_description = '''
Description says it (IOW, long_descriptions goes here!).
''',
       ext_modules = [two2gam_module])