anchor.diff:  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
  
positive.code: 
  # Pinned versions of stuff we pull in
  ENV AWESOMEBOT_VERSION=1.19.1
  ENV HTMLPROOFER_VERSION=3.12.0
  ENV LICENSEE_VERSION=9.11.0
  ENV MDL_VERSION=0.5.0
  
negative.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
  