anchor.diff:      apt-get update && \
       apt-get install -y --no-install-recommends --no-install-suggests \
         make \
  -      openjdk-${JDK_VER}-jdk-headless \
  +      openjdk-${JDK_VER}-jre-headless \
         wine && \
       apt-get autoremove --purge -y && \
       apt-get clean && \
  
positive.code: WORKDIR /sgdk
  ENV GDK=/sgdk
  
  # Crudely get the script from GitHub. This isn't very secure, but at least we
  # use the commit hash. Ideally that repository should simply be merged into this
  # one.
  ADD https://github.com/Franticware/SGDK_wine/raw/${SGDK_WINE_VER}/generate_wine.sh \
      /tmp/generate_wine.sh
  RUN chmod u+x /tmp/generate_wine.sh && \
      cd ${GDK}/bin && \
      /tmp/generate_wine.sh && \
      rm -f /tmp/generate_wine.sh
  
  # Set-up mount point and make command
  VOLUME /src
  WORKDIR /src
  
negative.code: FROM amd64/ubuntu:focal
  
  # Set-up argument defaults
  ARG SGDK_WINE_VER=1aca454a2c1419d97c3518907d156ddf1250469b
  ARG JRE_VER=14
  
  # Work-around required for JDK
  RUN mkdir -p /usr/share/man/man1
  