anchor.diff: -FROM python:3.7-stretch as build
  +FROM python:3.7-buster as build
   
   ENV \
     DEBIAN_FRONTEND=noninteractive \
  
positive.code:   && apt-get clean \
    && rm -rf /var/lib/apt/lists/*
  
  FROM python:3.7-slim-stretch
  
  ENV \
    DEBIAN_FRONTEND=noninteractive \
  
negative.code: RUN set -x \
    && apt-get update \
    && apt-get install -y --no-install-recommends \
      build-essential=12.6 \
      cmake=3.13.4-1 \
      libavcodec-dev=7:4.1.4-1~deb10u1 \
      libavdevice-dev=7:4.1.4-1~deb10u1 \
      libavfilter-dev=7:4.1.4-1~deb10u1 \
      libavformat-dev=7:4.1.4-1~deb10u1 \
      libavutil-dev=7:4.1.4-1~deb10u1 \
      libbluetooth-dev=5.50-1 \
      libcurl4-openssl-dev=7.64.0-4 \
      libglib2.0-dev=2.58.3-2+deb10u1 \
      libgmp-dev=2:6.1.2+dfsg-4 \
      libmpc-dev=1.1.0-1 \
      libmpfr-dev=4.0.2-1 \
      libswresample-dev=7:4.1.4-1~deb10u1 \
      libswscale-dev=7:4.1.4-1~deb10u1 \
      libudev-dev=241-7~deb10u1 \
      libxrandr-dev=2:1.5.1-1 \
      swig=3.0.12-2 \
    && pip3 install \
      --no-cache-dir \
      --prefix="${PYTHONUSERBASE}" \
  