anchor.diff:    postFixup = let
       rpath = stdenv.lib.makeLibraryPath
         (if cudaSupport then
  -        [ stdenv.cc.cc.lib zlib cudatoolkit cudnn
  +        [ stdenv.cc.cc.lib zlib cudatoolkit_joined cudnn
             linuxPackages.nvidia_x11 ]
         else
           [ stdenv.cc.cc.lib zlib ]
  
positive.code:   propagatedBuildInputs =
      [ numpy six protobuf mock backports_weakref ]
      ++ lib.optional (!isPy36) tensorflow-tensorboard
      ++ lib.optionals cudaSupport [ cudatoolkit cudnn stdenv.cc ];
  
    # tensorflow-gpu depends on tensorflow_tensorboard, which cannot be
    # built at the moment (some of its dependencies do not build
  
negative.code: { stdenv
  , symlinkJoin
  , lib
  , fetchurl
  , buildPythonPackage
  