old_contents: #! /usr/bin/env python3
  
  from distutils.core import setup
  from distutils.extension import Extension
  from Cython.Distutils import build_ext
  from Cython.Build import cythonize
  
  sourcefiles = ['pyroaring.pyx']
  croaring = cythonize(Extension('pyroaring',
                      sources = ['pyroaring.pyx', 'roaring.c'],
                      extra_compile_args=['-O3', '--std=c11', '-march=native'],
                      language='c++',
                      ))
  
  setup(
      name = 'pyroaring',
      ext_modules = croaring,
      version='0.0.7',
      description='Fast and lightweight set for unsigned 32 bits integers.',
      url='https://github.com/Ezibenroc/PyRoaringBitMap',
      author='Tom Cornebize',
      author_email='tom.cornebize@gmail.com',
      license='MIT',
      classifiers=[
          'License :: OSI Approved :: MIT License',
          'Intended Audience :: Developers',
          'Operating System :: POSIX :: Linux',
          'Operating System :: MacOS :: MacOS X',
          'Programming Language :: Python :: 2.7',
          'Programming Language :: Python :: 3.3',
          'Programming Language :: Python :: 3.4',
          'Programming Language :: Python :: 3.5',
      ],
  )
  
new_contents: #! /usr/bin/env python3
  
  from distutils.core import setup
  from distutils.extension import Extension
  from Cython.Distutils import build_ext
  from Cython.Build import cythonize
  import os
  os.environ['CC'] = 'cc'
  
  sourcefiles = ['pyroaring.pyx']
  croaring = cythonize(Extension('pyroaring',
                      sources = ['pyroaring.pyx', 'roaring.c'],
                      extra_compile_args=['-O3', '--std=c99', '-march=native'],
                      language='c++',
                      ))
  
  setup(
      name = 'pyroaring',
      ext_modules = croaring,
      version='0.0.7',
      description='Fast and lightweight set for unsigned 32 bits integers.',
      url='https://github.com/Ezibenroc/PyRoaringBitMap',
      author='Tom Cornebize',
      author_email='tom.cornebize@gmail.com',
      license='MIT',
      classifiers=[
          'License :: OSI Approved :: MIT License',
          'Intended Audience :: Developers',
          'Operating System :: POSIX :: Linux',
          'Operating System :: MacOS :: MacOS X',
          'Programming Language :: Python :: 2.7',
          'Programming Language :: Python :: 3.3',
          'Programming Language :: Python :: 3.4',
          'Programming Language :: Python :: 3.5',
      ],
  )
  
subject: Modify the compiler.