old_contents: from setuptools import setup, find_packages
  import sys, os.path
  
  # Don't import gym module here, since deps may not be installed
  sys.path.insert(0, os.path.join(os.path.dirname(__file__), 'gym'))
  from version import VERSION
  
  # Environment-specific dependencies.
  extras = {
    'atari': ['atari_py>=0.0.21', 'Pillow', 'PyOpenGL'],
    'board_game' : ['pachi-py>=0.0.19'],
    'box2d': ['box2d-py'],
    'classic_control': ['PyOpenGL'],
    'mujoco': ['mujoco_py>=0.4.3', 'imageio'],
    'parameter_tuning': ['keras', 'theano'],
  }
  
  # Meta dependency groups.
  all_deps = []
  for group_name in extras:
      all_deps += extras[group_name]
  extras['all'] = all_deps
  
  setup(name='gym',
        version=VERSION,
        description='The OpenAI Gym: A toolkit for developing and comparing your reinforcement learning agents.',
        url='https://github.com/openai/gym',
        author='OpenAI',
        author_email='gym@openai.com',
        license='',
        packages=[package for package in find_packages()
                  if package.startswith('gym')],
        zip_safe=False,
        install_requires=[
            'numpy>=1.10.4', 'requests>=2.0', 'six', 'pyglet>=1.2.0',
        ],
        extras_require=extras,
        package_data={'gym': ['envs/mujoco/assets/*.xml', 'envs/classic_control/assets/*.png']},
        tests_require=['pytest', 'mock'],
  )
  
new_contents: from setuptools import setup, find_packages
  import sys, os.path
  
  # Don't import gym module here, since deps may not be installed
  sys.path.insert(0, os.path.join(os.path.dirname(__file__), 'gym'))
  from version import VERSION
  
  # Environment-specific dependencies.
  extras = {
    'atari': ['atari_py>=0.0.21', 'Pillow', 'PyOpenGL'],
    'board_game' : ['pachi-py>=0.0.19'],
    'box2d': ['Box2D-kengz'],
    'classic_control': ['PyOpenGL'],
    'mujoco': ['mujoco_py>=0.4.3', 'imageio'],
    'parameter_tuning': ['keras', 'theano'],
  }
  
  # Meta dependency groups.
  all_deps = []
  for group_name in extras:
      all_deps += extras[group_name]
  extras['all'] = all_deps
  
  setup(name='gym',
        version=VERSION,
        description='The OpenAI Gym: A toolkit for developing and comparing your reinforcement learning agents.',
        url='https://github.com/openai/gym',
        author='OpenAI',
        author_email='gym@openai.com',
        license='',
        packages=[package for package in find_packages()
                  if package.startswith('gym')],
        zip_safe=False,
        install_requires=[
            'numpy>=1.10.4', 'requests>=2.0', 'six', 'pyglet>=1.2.0',
        ],
        extras_require=extras,
        package_data={'gym': ['envs/mujoco/assets/*.xml', 'envs/classic_control/assets/*.png']},
        tests_require=['pytest', 'mock'],
  )
  
subject: fix issue #100 with new Box2D-kengz dependency (#558)