Unresolved external symbols building Python C extension

I'm currently trying to build a C-extension in Windows. The errors seem related to not finding 'standard' symbols in the python27.dll. How do I resolve these missing symbols? Do I need to somehow tell the compiler where to find python27.dll or is something wrong with my python27.lib? My setup is the following: - Windows 7 64-bit - Python 2.7.4 - Numpy 1.7 - Swig 2.0.9 - Visual studio 9.0 I found this link that seems to have a related problem, but with versions of things I'm not using: http://bugs.python.org/issue15772 I'm running `python setup.py build_ext --inplace` to build the extension. The setup.py looks like the following: ``` try: numpy_include = numpy.get_include() except AttributeError: numpy_include = numpy.get_numpy_include() fmm3d_module = Extension('_fmm3d', sources=['fmm3d.i', 'fmm3d.c'], include_dirs = [numpy_include]) ``` Everything compiles fine and then runs the following link command: ``` C:\Program Files (x86)\Microsoft Visual Studio 9.\VC\BIN\link.exe /DLL /nologo /INCREMENTAL:NO /LIBPATH:C:\Python27\libs /LIBPATH:C:\Python27\PCbuild\ amd64 /EXPORT:init_fmm3d build\temp.win-amd64-2.7\Release\fmm3d_wrap.obj build\temp.win-amd64-2.7\Release\fmm3d.obj /OUT:C:\Users\luke\Documents\Ranking\code\_fmm3d.pyd /IMPLIB:build\temp.win-amd64-2.7\Release\_fmm3d.lib /MANIFESTFILE:build\temp.win-amd64-2.7\Release\_fmm3d.pyd.manifest ``` I get link errors that relate to Python symbols like the following: ``` fmm3d_wrap.obj : error LNK2019: unresolved external symbol __imp__PyString_AsString referenced in function _SWIG_Python_str_AsChar fmm3d_wrap.obj : error LNK2019: unresolved external symbol __imp__PyString_FromString referenced in function _SWIG_Python_str_FromChar fmm3d_wrap.obj : error LNK2019: unresolved external symbol __imp__PyExc_RuntimeError referenced in function _SWIG_Python_ErrorType fmm3d_wrap.obj : error LNK2019: unresolved external symbol __imp__PyExc_AttributeError referenced in function _SWIG_Python_ErrorType ``` I've found the Python lib file located at C:Python27\libs\python27.lib. I assume the symbols are expected to be in here. In fact, it looks like they are at least referenced in this file. For example, running `dumpbin -headers C:\Python27\libs\python27.lib` shows the following snippet: ``` Version : 0 Machine : 8664 (x64) TimeDateStamp: 5160619D Sat Apr 06 12:55:41 2013 SizeOfData : 0000001F DLL name : python27.dll Symbol name : PyString_AsString Type : code Name type : name Hint : 629 Name : PyString_AsString ``` This leads me to believe that the python27.lib says the reference for PyString_AsString is contained in python27.dll. Is there some other command-line argument I'm missing to locate these symbols?