anchor.diff:    && gem install grpc-tools --version '=1.10.0' --no-ri --no-rdoc
   
   # Install grpc_php_plugin
  -RUN git clone -b v1.7.2 --recurse-submodules https://github.com/grpc/grpc.git /temp/grpc \
  +RUN git clone -b v1.7.2 --recurse-submodules --depth=1 https://github.com/grpc/grpc.git /temp/grpc \
     && cd /temp/grpc \
     && make -j $(nproc) grpc_php_plugin \
     && mv ./bins/opt/grpc_php_plugin /usr/local/bin/ \
  
positive.code:     && ln -s /usr/share/dotnet/dotnet /usr/bin/dotnet
  
  # Install googleapis.
  RUN git clone https://github.com/googleapis/googleapis --single-branch \
    && cd googleapis \
    && git checkout $GOOGLEAPIS_HASH \
    && cd .. \
    && rm -rf /googleapis/.git/
  
  # Install toolkit.
  RUN git clone https://github.com/googleapis/gapic-generator toolkit \
    && cd toolkit/ \
    && git checkout $GAPIC_GENERATOR_HASH \
    && ./gradlew fatJar createToolPaths \
  
negative.code:     libtool \
      autotools-dev \
      automake \
      make \
      g++ \
      # Used to create Python doc
      pandoc \
      # .NET dependencies
  