anchor.diff:  
   RUN apt-get update \
     && apt-get install --no-install-recommends -y $OTBR_DOCKER_REQS $OTBR_DOCKER_DEPS \
  +  && ([ "${OT_BACKBONE_CI}" != "1" ] || apt-get install --no-install-recommends -y $OTBR_OT_BACKBONE_CI_DEPS) \
     && ln -fs /usr/share/zoneinfo/UTC /etc/localtime \
     && ./script/bootstrap \
     && ./script/setup \
  
positive.code: #  POSSIBILITY OF SUCH DAMAGE.
  #
  
  FROM ubuntu:bionic
  
  ARG OT_BACKBONE_CI
  ARG OTBR_OPTIONS
  
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 \
  