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Compilation error on OS X

Hello, it seems that setup.py is missing NumPy includes, which results in the following compilation error:

building 'align' extension

creating build

creating build/temp.macosx-10.8-intel-2.7

clang -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch i386 -arch x86_64 -pipe -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c align.c -o build/temp.macosx-10.8-intel-2.7/align.o

clang: error: no such file or directory: 'align.c'

clang: error: no input files

error: command 'clang' failed with exit status 1

Here's a working version of setup.py:

from setuptools import setup
from setuptools.extension import Extension
from Cython.Distutils import build_ext
import numpy as np

setup(name="calign",
      version='0.1',
      description='Global and local sequence alignment implemented in C for speed.',
      author='Fredrik Appelros, Carl Ekerot',
      author_email='[email protected], [email protected]',
      url='https://github.com/FredrikAppelros/align',
      install_requires=['numpy', 'cython'],
      cmdclass = {'build_ext': build_ext},
      include_dirs = [np.get_include()],
      ext_modules = [Extension('align', ['src/align.pyx', 'src/calign.c'])],
)