anchor.diff:        license = licenses.free;
       };
     } else null;
  -
  +  
     funcsigs = buildPythonPackage rec {
       name = "funcsigs-1.0.2";
   
  
positive.code: 
    tensorflowNoGpuSupport = buildPythonPackage rec {
      name = "tensorflow";
      version = "0.9.0";
      format = "wheel";
  
      src = pkgs.fetchurl {
        url = "https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-${version}-cp27-none-linux_x86_64.whl";
        sha256 = "15v7iyry8bmp5wcc1rr4bkp80f3887rl99zqf8pys5bad4gldbkh";
      };
  
      propagatedBuildInputs = with self; [ numpy six protobuf3_0_0b2 pkgs.swig ];
  
      preFixup = ''
        RPATH="${stdenv.lib.makeLibraryPath [ pkgs.gcc.cc.lib pkgs.zlib ]}"
  
negative.code:       description = "TensorFlow helps the tensors flow (no gpu support)";
        homepage = http://tensorflow.org;
        license = licenses.asl20;
        platforms = with platforms; linux ++ darwin;
      };
    };
  
  