anchor.diff:  RUN dpkg --add-architecture i386 && \
       apt-get update && \
       apt-get install -y --no-install-recommends libncurses5:i386 libc6:i386 libstdc++6:i386 lib32gcc1 lib32ncurses6 lib32z1 zlib1g:i386 && \
  -    apt-get install -y --no-install-recommends openjdk-8-jdk && \
  +    apt-get install -y --no-install-recommends openjdk-${JDK_VERSION}-jdk && \
       apt-get install -y --no-install-recommends git wget unzip && \
       apt-get install -y --no-install-recommends qt5-default
   
  
positive.code:     rm *tools*linux*.zip
  
  # set the environment variables
  ENV JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64
  ENV GRADLE_HOME /opt/gradle
  ENV KOTLIN_HOME /opt/kotlinc
  ENV PATH ${PATH}:${GRADLE_HOME}/bin:${KOTLIN_HOME}/bin:${ANDROID_SDK_ROOT}/cmdline-tools/tools/bin:${ANDROID_SDK_ROOT}/platform-tools:${ANDROID_SDK_ROOT}/emulator
  
negative.code: # ---------------------------------------------------------------------- #
  LABEL maintainer "thyrlian@gmail.com"
  
  ARG JDK_VERSION=8
  # support multiarch: i386 architecture
  # install Java
  # install essential tools
  