anchor.diff:      cd /opt && \
       wget --quiet https://storage.googleapis.com/flutter_infra/releases/stable/linux/flutter_linux_v1.12.13+hotfix.8-stable.tar.xz -O flutter.tar.xz && \
       tar xf flutter.tar.xz && \
  -    rm -f flutter.tar.xz && \
  -    flutter config --no-analytics
  +    flutter config --no-analytics && \
  +    rm -f flutter.tar.xz
   
   # Copy sdk license agreement files.
   RUN mkdir -p $ANDROID_HOME/licenses
  
positive.code: # Install SDKs
  # Please keep these in descending order!
  # The `yes` is for accepting all non-standard tool licenses.
      mkdir --parents "$ANDROID_HOME/.android/" && \
      echo '### User Sources for Android SDK Manager' > \
          "$ANDROID_HOME/.android/repositories.cfg" && \
      yes | "$ANDROID_HOME"/tools/bin/sdkmanager --licenses > /dev/null && \
      echo "Installing platforms" && \
      yes | "$ANDROID_HOME"/tools/bin/sdkmanager \
  
negative.code:         pkg-config \
          software-properties-common \
          ruby-full \
          unzip \
          wget \
          zip \
  