anchor.diff:  
   ENV ANDROID_SDK_REVISION 24.3.4
   
  -RUN curl -L -O "http://dl.google.com/android/android-sdk_r$ANDROID_SDK_REVISION-linux.tgz"
  -RUN tar -xvzf "android-sdk_r$ANDROID_SDK_REVISION-linux.tgz"
  -RUN mv android-sdk-linux /usr/local/android-sdk
  -RUN rm android-sdk_r$ANDROID_SDK_REVISION-linux.tgz
  +RUN curl -L -O "http://dl.google.com/android/android-sdk_r$ANDROID_SDK_REVISION-linux.tgz" \
  +    && tar -xvzf "android-sdk_r$ANDROID_SDK_REVISION-linux.tgz" \
  +    && mv android-sdk-linux /usr/local/android-sdk \
  +    && rm android-sdk_r$ANDROID_SDK_REVISION-linux.tgz
   
   ENV ANDROID_HOME /usr/local/android-sdk
   ENV PATH $PATH:$ANDROID_HOME/tools
  
positive.code: # apt
  # ================================================================
  
  RUN dpkg --add-architecture i386
  RUN apt-get update
  RUN apt-get -y install \
          curl \
          unzip \
          libncurses5:i386 \
          libstdc++6:i386 \
          zlib1g:i386
  RUN apt-get clean
  
  
  # ================================================================
  
negative.code: 
  ENV ANDROID_BUILD_TOOOS_REVISION 23.0.1
  ENV ANDROID_PLATFORM_VERSION 23
  ENV ANDROID_EMULATOR_ABI armeabi-v7a
  ENV ANDROID_EMULATOR_TARGET_NAME android-emulator
  
  RUN echo y | android update sdk --no-ui --all --force --filter \
          platform-tools,build-tools-$ANDROID_BUILD_TOOOS_REVISION,android-$ANDROID_PLATFORM_VERSION \
      && echo y | android update sdk --no-ui --all --force --filter \
          extra-google-m2repository,extra-android-support,extra-android-m2repository \
      && echo y | android update sdk --no-ui --all --force --filter \
          sys-img-$ANDROID_EMULATOR_ABI-android-$ANDROID_EMULATOR_TARGET_VERSION
  
  
  # ================================================================
  