anchor.diff:  
         # cudaSupport causes fetch of ncclArchive, resulting in different hashes
         sha256 = if cudaSupport then
  -        "0gmwwcld8hm1nfxmx2w2gqxjxq5b5ln7vbxn0x63x9yy7avs3dkp"
  +        "07p6f3rbdw7y2ky5wrldjcvzdzhcynlmmydwb7cz12iphazhmipy"
         else
           "1d67h0n461cyfimzlsj6bv9p95iv9jhglr0izdc6y0n6w09z8pw0";
       };
  
positive.code:       export PATH="$PWD/dummy-ldconfig:$PATH"
  
        export PYTHON_LIB_PATH="$NIX_BUILD_TOP/site-packages"
        mkdir -p "$PYTHON_LIB_PATH"
      '';
  
  
negative.code:     bazelFlags = [
        # temporary fixes to make the build work with bazel 0.27
        "--incompatible_no_support_tools_in_action_inputs=false"
      ];
      bazelBuildFlags = [
        "--config=opt" # optimize using the flags set in the configure phase
      ];
  
      bazelTarget = "//tensorflow/tools/pip_package:build_pip_package //tensorflow/tools/lib_package:libtensorflow";
  
  