anchor.diff:  , hdf5
   , boost
   , gflags
  -, protobuf
  +, protobuf3_19
   , config
   , ocl-icd
   , buildPackages
  
positive.code: }:
  
  let
    version = "4.5.4";
  
    src = fetchFromGitHub {
  
negative.code:     "-DOPENCV_GENERATE_PKGCONFIG=ON"
      "-DWITH_OPENMP=ON"
      "-DBUILD_PROTOBUF=OFF"
      "-DProtobuf_PROTOC_EXECUTABLE=${protoc}"
      "-DPROTOBUF_UPDATE_FILES=ON"
      "-DOPENCV_ENABLE_NONFREE=${printEnabled enableUnfree}"
      "-DBUILD_TESTS=OFF"
  