from distutils.core import setup, Extension
from numpy.distutils.misc_util import get_numpy_include_dirs

setup(ext_modules=[Extension("arc_c_extensions", ["arc_c_extensions.c"],
                             extra_compile_args = ['-Wall', '-std=c99','-O3'],
      include_dirs=get_numpy_include_dirs())])

from distutils.core import setup, Extension
from numpy.distutils.misc_util import get_numpy_include_dirs

setup(ext_modules=[Extension("arc_c_extensions", ["arc_c_extensions.c"],
                             extra_compile_args = ['-Wall', '-O3'],
      include_dirs=get_numpy_include_dirs())])

Update setupc.py