anchor.diff:        owner = "tensorflow";
         repo = "tensorflow";
         rev = "v${version}";
  -      sha256 = "1q0848drjvnaaa38dgns8knmpmkj5plzsc98j20m5ybv68s55w78";
  +      sha256 = "0lg8ahyr2k7dmp0yfypk8ivl9a0xcg3j0f0dakmn5ljk8nsji0bj";
       };
   
       patches = [
  
positive.code: 
        # cudaSupport causes fetch of ncclArchive, resulting in different hashes
        sha256 = if cudaSupport then
          "09j57w6kc0vkfcdwr0qggy3qgrgq82kfa2jrwvvcnij4bl3wj40j"
        else
          "14g8z49qz7d8n1c2mcsfhr7yqpcy7mhmpm6hgmqvpgb8vm7yvwrc";
      };
  
      buildAttrs = {
  
negative.code:       # include security vulnerabilities. So we make it optional.
        # https://github.com/tensorflow/tensorflow/issues/20280#issuecomment-400230560
        sed -i '/tensorboard >=/d' tensorflow/tools/pip_package/setup.py
  
        substituteInPlace tensorflow/tools/pip_package/setup.py \
          --replace "numpy >= 1.16.0, < 1.19.0" "numpy >= 1.16.0"
      '';
  
      preConfigure = let
  