old_contents: from distutils.core import setup, Extension
  from Cython.Build import cythonize
  
  
  ext_modules = [
      Extension("cython_math.cython_math",
                ["cython_math/cython_math.pyx"]),
      Extension("cython_math._utilities",
                ["cython_math/_utilities.pyx"])
  ]
  
  setup(
      ext_modules = cythonize(ext_modules)
  )
  
new_contents: from distutils.core import setup, Extension
  from Cython.Build import cythonize
  
  
  DESCRIPTION = """\
  Cython math provides fused-type wrappers for C99 math.h and complex.h
  functions.
  """
  
  ext_modules = [
      Extension("cython_math.cython_math",
                ["cython_math/cython_math.pyx"]),
      Extension("cython_math._utilities",
                ["cython_math/_utilities.pyx"])
  ]
  
  setup(
      name="Cython Math",
      description=DESCRIPTION,
      author="Josh Wilson",
      ext_modules=cythonize(ext_modules),
      packages=["cython_math"],
      package_data={"cython_math": ["__init__.pxd",
                                    "cython_math.pxd"]}
  )
  
subject: add more package info to `setup.py`