anchor.diff:  
   # Pinned versions of stuff we pull in
   ENV AWESOMEBOT_VERSION=1.19.1
  +ENV FPM_VERSION=1.11.0
   ENV HTMLPROOFER_VERSION=3.12.0
   ENV LICENSEE_VERSION=9.11.0
   ENV MDL_VERSION=0.5.0
  
positive.code: 
  ENV DOCKER_VERSION=5:19.03.2~3-0~ubuntu-xenial
  ENV CONTAINERD_VERSION=1.2.6-3
  ENV OUTDIR=/out
  
  # required for binary tools: ca-certificates, gcc, libc-dev, git, iptables, libltdl7
  
negative.code: RUN gem install --no-wrappers --no-document html-proofer -v ${HTMLPROOFER_VERSION}
  RUN gem install --no-wrappers --no-document awesome_bot -v ${AWESOMEBOT_VERSION}
  RUN gem install --no-wrappers --no-document licensee -v ${LICENSEE_VERSION}
  RUN gem install --no-wrappers --no-document fpm -v ${FPM_VERSION}
  
  #############
  # Python
  