old_contents: from distutils.core import setup
  from distutils.extension import Extension
  from Cython.Distutils import build_ext
  
  setup(
      name = 'nmsg',
      ext_modules = [
          Extension('nmsg', ['nmsg.pyx'],
              libraries = ['nmsg'],
              library_dirs = ['../nmsg/.libs'],
              include_dirs = ['../nmsg']
          )
      ],
      cmdclass = {'build_ext': build_ext},
  )
  
new_contents: from distutils.core import setup
  from distutils.extension import Extension
  from Cython.Distutils import build_ext
  
  setup(
      name = 'nmsg',
      ext_modules = [
          Extension('nmsg', ['nmsg.pyx'],
              libraries = ['nmsg'],
              library_dirs = ['../nmsg/.libs'],
              include_dirs = ['../nmsg', '..']
          )
      ],
      cmdclass = {'build_ext': build_ext},
  )
  
subject: add '..' to include path list