old_contents: import platform
  
  from setuptools import Extension, find_packages, setup
  
  
  # PyPy does include glibc standard headers, but does not define any of the
  # feature_test_macros(7)
  # CPython on the other hand complains, if you define any of these macros
  if platform.python_implementation() == 'PyPy':
      define_macros = [
              ('_XOPEN_SOURCE', '700'),
              ('_DEFAULT_SOURCE', '1'),
              ('_BSD_SOURCE', '1'),
      ]
  else:
      define_macros = None
  
  arpreq = Extension('arpreq', sources=['src/arpreq.c'],
                     extra_compile_args=['-std=c99'],
                     define_macros=define_macros)
  
  python_major_version = platform.python_version_tuple()[0]
  
  
  tests_require = [
          'pytest',
          'netaddr'
  ]
  if python_major_version == '2':
      tests_require.append('ipaddr')
      tests_require.append('ipaddress')
  
  with open('README.rst') as f:
      readme = f.read()
  
  setup(name='arpreq',
        author='Sebastian Schrader',
        author_email='sebastian.schrader@ossmail.de',
        url='https://github.com/sebschrader/python-arpreq',
        version='0.3.2',
        description="Query the Kernel ARP cache for the MAC address "
                    "corresponding to IP address",
        long_description=readme,
        package_dir={'': 'src'},
        packages=find_packages(exclude=['tests']),
        setup_requires=[
            'pytest-runner'
        ],
        tests_require=tests_require,
        ext_modules=[arpreq],
        license='MIT',
        classifiers=[
            'Development Status :: 5 - Production/Stable',
            'License :: OSI Approved :: MIT License',
            'Intended Audience :: Developers',
            'Intended Audience :: System Administrators',
            'Operating System :: POSIX :: Linux',
            'Programming Language :: C',
            'Programming Language :: Python :: 2',
            'Programming Language :: Python :: 2.6',
            'Programming Language :: Python :: 2.7',
            'Programming Language :: Python :: 3',
            'Programming Language :: Python :: 3.3',
            'Programming Language :: Python :: 3.4',
            'Programming Language :: Python :: 3.5',
            'Programming Language :: Python :: 3.6',
            'Programming Language :: Python :: Implementation :: CPython',
            'Programming Language :: Python :: Implementation :: PyPy',
            'Topic :: System :: Networking',
        ],
        )
  
new_contents: import platform
  
  from setuptools import Extension, find_packages, setup
  
  
  # PyPy does include glibc standard headers, but does not define any of the
  # feature_test_macros(7)
  # CPython on the other hand complains, if you define any of these macros
  if platform.python_implementation() == 'PyPy':
      define_macros = [
              ('_XOPEN_SOURCE', '700'),
              ('_DEFAULT_SOURCE', '1'),
              ('_BSD_SOURCE', '1'),
      ]
  else:
      define_macros = None
  
  arpreq = Extension('arpreq', sources=['src/arpreq.c'],
                     extra_compile_args=['-std=c99'],
                     define_macros=define_macros)
  
  python_major_version = platform.python_version_tuple()[0]
  
  
  tests_require = [
          'pytest',
          'netaddr'
  ]
  if python_major_version == '2':
      tests_require.append('ipaddr')
      tests_require.append('ipaddress')
  
  with open('README.rst') as f:
      readme = f.read()
  
  setup(name='arpreq',
        author='Sebastian Schrader',
        author_email='sebastian.schrader@ossmail.de',
        url='https://github.com/sebschrader/python-arpreq',
        version='0.3.2',
        description="Query the Kernel ARP cache for the MAC address "
                    "corresponding to IP address",
        long_description=readme,
        package_dir={'': 'src'},
        packages=find_packages(exclude=['tests']),
        setup_requires=[
            'pytest-runner'
        ],
        tests_require=tests_require,
        ext_modules=[arpreq],
        license='MIT',
        platforms=["any"],
        classifiers=[
            'Development Status :: 5 - Production/Stable',
            'License :: OSI Approved :: MIT License',
            'Intended Audience :: Developers',
            'Intended Audience :: System Administrators',
            'Operating System :: POSIX :: Linux',
            'Programming Language :: C',
            'Programming Language :: Python :: 2',
            'Programming Language :: Python :: 2.6',
            'Programming Language :: Python :: 2.7',
            'Programming Language :: Python :: 3',
            'Programming Language :: Python :: 3.3',
            'Programming Language :: Python :: 3.4',
            'Programming Language :: Python :: 3.5',
            'Programming Language :: Python :: 3.6',
            'Programming Language :: Python :: Implementation :: CPython',
            'Programming Language :: Python :: Implementation :: PyPy',
            'Topic :: System :: Networking',
        ],
        )
  
subject: Add platform meta-data