anchor.diff:        compatibility.
       '';
       homepage = "https://github.com/microsoft/onnxruntime";
  +    changelog = "https://github.com/microsoft/onnxruntime/releases";
  +    # https://github.com/microsoft/onnxruntime/blob/master/BUILD.md#architectures
  +    platforms = platforms.unix;
       license = licenses.mit;
       maintainers = with maintainers; [ jonringer ];
     };
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "onnxruntime";
    version = "0.5.0";
  
    src = fetchFromGitHub {
      owner = "microsoft";
      repo = "onnxruntime";
      rev = "v${version}";
      sha256 = "0s8ylc5xr55490hbz7zn3hnp9dnyp92d320ln8xw5hqkw3mgyr3p";
      # TODO: use nix-versions of grpc, onnx, eigen, googletest, etc.
      # submodules increase src size and compile times significantly
      # not currently feasible due to how integrated cmake build is with git
  
negative.code:     rm -r $out/bin   # ctest runner
    '';
  
    enableParallelBuilding = true;
  
    meta = with stdenv.lib; {
      description = "Cross-platform, high performance scoring engine for ML models";
      longDescription = ''
  