Working setup.py with a requires numpy (without numpy include_dirs)

setup.py

#from distutils.core import setup, Extension
#import numpy
from setuptools import setup, Extension

cpu_hamming = Extension('cpu_hamming',
                        define_macros=[('MAJOR_VERSION', '0'),
                                       ('MINOR_VERSION', '6')],
                        libraries=['m'],
                        extra_compile_args=["-pthread", "--std=c++0x", "-msse4.2",
                                            "-funroll-loops", "-O3", "-mfpmath=sse"],
                        sources=['cpu/ham.cpp'])

setup(ext_modules=[cpu_hamming],
      name='nearest',
      version='0.6.0',
      description='Nearest Neighour Search',
      author='njh',
      author_email='nhurst@shutterstock.com',
      packages=['nearest'],
      setup_requires=["numpy"],
      install_requires=["numpy", "cffi"],
      #include_dirs=[numpy.get_include()],
      )