anchor.diff:  # install system dependencies
   RUN dpkg --add-architecture i386 \
       && ${RETRY} apt -y update -qq > /dev/null \
  -    && ${RETRY} apt -y install -qq --no-install-recommends \
  +    && ${RETRY} DEBIAN_FRONTEND=noninteractive apt install -qq --yes --no-install-recommends \
       autoconf \
       automake \
       autopoint \
  
positive.code: #     Use 'docker run' without '--rm' flag for keeping the container and use
  #     'docker commit <container hash> <new image>' to extend the original image
  
  FROM ubuntu:18.04
  
  # configure locale
  RUN apt update -qq > /dev/null && apt install -qq --yes --no-install-recommends \
      locales && \
      locale-gen en_US.UTF-8
  ENV LANG="en_US.UTF-8" \
      LANGUAGE="en_US.UTF-8" \
      LC_ALL="en_US.UTF-8"
  
  RUN apt -y update -qq > /dev/null && apt -y install -qq --no-install-recommends \
  	ca-certificates \
      curl \
      && apt -y autoremove \
  
negative.code:     libidn11:i386 \
      libltdl-dev \
      libncurses5:i386 \
      libssl-dev \
      libstdc++6:i386 \
      libtool \
  