anchor.diff:  RUN cd /opt \
       && wget -q https://dl.google.com/android/repository/sdk-tools-linux-3952940.zip -O android-sdk-tools.zip \
       && unzip -q android-sdk-tools.zip -d ${ANDROID_HOME} \
  -    && rm -f android-sdk-tools.zip
  +    && rm android-sdk-tools.zip
   
   ENV PATH ${PATH}:${ANDROID_HOME}/tools:${ANDROID_HOME}/tools/bin:${ANDROID_HOME}/platform-tools
   
  
positive.code:     "build-tools;23.0.3" \
      "build-tools;22.0.1" \
      "build-tools;21.1.2" \
      "build-tools;20.0.0" \
      "build-tools;19.1.0" \
      "build-tools;17.0.0" \
  # Android System Images, for emulators
  
negative.code: RUN cd /opt \
   && wget https://dl.google.com/android/repository/emulator-linux-4077558.zip -O emulator.zip \
   && unzip -q emulator.zip -d ${ANDROID_HOME} \
   && rm emulator.zip
  
  # SDKs
  # Please keep these in descending order!
  