anchor.diff:  # support multiarch: i386 architecture
   # install Java
   # install essential tools
  -# install Qt
   ARG JDK_VERSION=11
   RUN dpkg --add-architecture i386 && \
       apt-get update && \
  
positive.code: 
  # download and install Kotlin compiler
  # https://github.com/JetBrains/kotlin/releases/latest
  ARG KOTLIN_VERSION=1.6.21
  RUN cd /opt && \
      wget -q https://github.com/JetBrains/kotlin/releases/download/v${KOTLIN_VERSION}/kotlin-compiler-${KOTLIN_VERSION}.zip && \
      unzip *kotlin*.zip && \
  
negative.code: 
  # download and install Android SDK
  # https://developer.android.com/studio#command-tools
  ARG ANDROID_SDK_VERSION=8512546
  ENV ANDROID_SDK_ROOT /opt/android-sdk
  RUN mkdir -p ${ANDROID_SDK_ROOT}/cmdline-tools && \
      wget -q https://dl.google.com/android/repository/commandlinetools-linux-${ANDROID_SDK_VERSION}_latest.zip && \
  