title: Cannot build wheel error when trying to install openAI gym
body: <p>I saw that failure to build wheel atari-py, pachi-py was a common problem people ran into when installing openai gym in mac. And the solutions suggested in them was to use export commands export MACOSX_DEPLOYMENT_TARGET=10.11 
  export SDKROOT=/path/to/Mac10.11SDK before making the build. I tried the given suggestions and yet I am finding the same error when trying to install full openai gym. Can anyone help me in getting around this issue ? </p>