anchor.diff:  
   ARG ANDROID_NDK_VERSION=r21d
   
  -RUN wget "https://dl.google.com/android/repository/android-ndk-${ANDROID_NDK_VERSION?}-linux-x86_64.zip"
  -RUN unzip "android-ndk-${ANDROID_NDK_VERSION?}-linux-x86_64.zip" -d /android-ndk
  +RUN wget "https://dl.google.com/android/repository/android-ndk-${ANDROID_NDK_VERSION?}-linux-x86_64.zip" \
  +  && unzip "android-ndk-${ANDROID_NDK_VERSION?}-linux-x86_64.zip" -d /android-ndk && \
  +  rm -rf /usr/src
   
   ENV ANDROID_NDK="/android-ndk/android-ndk-${ANDROID_NDK_VERSION}"
   
  
positive.code:   ninja-build \
    software-properties-common \
    unzip \
    wget
  
  ENV CC=/usr/bin/clang
  ENV CXX=/usr/bin/clang++
  
negative.code: 
  ARG SWIFTSHADER_COMMIT=b3c1e71eb1cb55ba78a3f884ab4e68ef1bd396da
  
  RUN git clone https://github.com/google/swiftshader \
    && cd swiftshader && git checkout "${SWIFTSHADER_COMMIT?}" && cd .. \
    && cmake -S swiftshader/ -B build-swiftshader/ \
             -GNinja \
             -DSWIFTSHADER_BUILD_VULKAN=ON \
             -DSWIFTSHADER_BUILD_EGL=OFF \
             -DSWIFTSHADER_BUILD_GLESv2=OFF \
             -DSWIFTSHADER_BUILD_GLES_CM=OFF \
             -DSWIFTSHADER_BUILD_PVR=OFF \
             -DSWIFTSHADER_BUILD_TESTS=OFF \
    && cmake --build build-swiftshader/ \
             --config Release \
             --target vk_swiftshader \
    && cp -rf build-swiftshader/Linux /swiftshader \
    && echo "${SWIFTSHADER_COMMIT?}" > /swiftshader/git-commit \
    && rm -rf /usr/src
  