anchor.diff:      "LD_LIBRARY_PATH=${cudaStub}\${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH ";
   
   in buildPythonPackage rec {
  -  version = "1.4.1";
  +  version = "1.5.0";
     pname = "pytorch";
     disabled = !isPy3k;
   
  
positive.code:   '' + lib.optionalString (cudaSupport && cudnn != null) ''
      export CUDNN_INCLUDE_DIR=${cudnn}/include
    '';
  
    patches = [
      # Prevents a race condition which would be introduced by pull 30333.
      # See https://github.com/pytorch/pytorch/issues/32277
      # Can be removed >1.5.0.
      (fetchpatch {
        url = "https://patch-diff.githubusercontent.com/raw/pytorch/pytorch/pull/30332.patch";
        sha256 = "1v9dwbhz3rdxcx6sz8y8j9n3bj6nqs78b1r8yg89yc15n6l4cqx2";
      })
  
      # Fixes errors with gcc-9 compilation. Cherry-picked on advice from ezyang.
      # See https://github.com/pytorch/pytorch/issues/32277
      # Can be removed >1.5.0.
      (fetchpatch {
        url = "https://patch-diff.githubusercontent.com/raw/pytorch/pytorch/pull/30333.patch";
        sha256 = "139413fl37h2fnil0cv99a67mqqnsh02k74b92by1qyr6pcfyg3q";
      })
    ];
  
    # Use pytorch's custom configurations
    dontUseCmakeConfigure = true;
  
negative.code:     repo   = "pytorch";
      rev    = "v${version}";
      fetchSubmodules = true;
      sha256 = "19qyrjd72mc0llcfn50av8ym05f2iwa38gv068wykji4ph7qjlv2";
    };
  
    preConfigure = lib.optionalString cudaSupport ''
  