anchor.diff:    && apt-get update \
     && apt-get install -y --no-install-recommends \
       ca-certificates=20190110 \
  -    nmap=7.40-1 \
  -    net-tools=1.60+git20161116.90da8a0-1 \
  -    bluetooth=5.43-2+deb9u1 \
  -    ffmpeg=7:3.2.14-1~deb9u1 \
  -    iperf3=3.1.3-1 \
  -    nut-client=2.7.4-5 \
  +    nmap=7.70+dfsg1-6 \
  +    net-tools=1.60+git20180626.aebd88e-1 \
  +    bluetooth=5.50-1 \
  +    ffmpeg=7:4.1.4-1~deb10u1 \
  +    iperf3=3.6-2 \
  +    nut-client=2.7.4-8 \
     && apt-get autoremove -y \
     && apt-get clean \
     && apt-get autoclean \
  
positive.code: RUN set -x \
    && apt-get update \
    && apt-get install -y --no-install-recommends \
      build-essential=12.3 \
      cmake=3.7.2-1 \
      libavcodec-dev=7:3.2.14-1~deb9u1 \
      libavdevice-dev=7:3.2.14-1~deb9u1 \
      libavfilter-dev=7:3.2.14-1~deb9u1 \
      libavformat-dev=7:3.2.14-1~deb9u1 \
      libavutil-dev=7:3.2.14-1~deb9u1 \
      libbluetooth-dev=5.43-2+deb9u1 \
      libcurl4-openssl-dev=7.52.1-5+deb9u9 \
      libglib2.0-dev=2.50.3-2+deb9u1 \
      libgmp-dev=2:6.1.2+dfsg-1 \
      libmpc-dev=1.0.3-1+b2 \
      libmpfr-dev=3.1.5-1 \
      libswresample-dev=7:3.2.14-1~deb9u1 \
      libswscale-dev=7:3.2.14-1~deb9u1 \
      libudev-dev=232-25+deb9u12 \
      libxrandr-dev=2:1.5.1-1 \
      swig=3.0.10-1.1 \
    && pip3 install \
      --no-cache-dir \
      --prefix="${PYTHONUSERBASE}" \
  
negative.code:   && apt-get clean \
    && rm -rf /var/lib/apt/lists/*
  
  FROM python:3.7-slim-buster
  
  ENV \
    DEBIAN_FRONTEND=noninteractive \
  