anchor.diff:  #  POSSIBILITY OF SUCH DAMAGE.
   #
   
  -FROM ubuntu:bionic
  +FROM ubuntu:focal
   
   ARG OT_BACKBONE_CI
   ARG OTBR_OPTIONS
  
positive.code:     && apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false $OTBR_BUILD_DEPS  \
      && ([ "${RELEASE}" = 1 ] ||  apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false "$OTBR_NORELEASE_DEPS";) \
      && rm -rf /var/lib/apt/lists/* \
    ) \
    && [ "${OT_BACKBONE_CI}" != "1" ] || apt-get install --no-install-recommends -y $OTBR_OT_BACKBONE_CI_DEPS
  
  ENTRYPOINT ["/app/etc/docker/docker_entrypoint.sh"]
  
  
negative.code:   libavahi-client-dev libboost-dev libboost-filesystem-dev libboost-system-dev libjsoncpp-dev
  
  # Required for OpenThread Backbone CI
  ENV OTBR_OT_BACKBONE_CI_DEPS curl
  
  # Required and installed during build (script/bootstrap) when RELEASE=1, could be removed
  ENV OTBR_NORELEASE_DEPS \
  