anchor.diff:  WORKDIR /opt/latexml
   RUN cpanm --verbose --skip-installed https://github.com/brucemiller/LaTeXML/tarball/master
   
  +# libunix-processors-perl \ # only in 20.04 and newer
   # cortex worker dependencies
   RUN set -ex && apt-get update -qq && apt-get install -qy \
     libarchive-zip-perl \
  
positive.code: ##
  ## run example via:
  ##
  ## docker run --cpus="16.0" --memory="32g" --shm-size="16g" latexml-plugin-cortex:1.0 latexml_harness 127.0.0.1
  
  FROM ubuntu:20.04
  ENV TZ=America/New_York
  RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
  
  
negative.code:   libtest-sharedfork-perl \
    libtest-tcp-perl \
    libtest-weaken-perl \
    libzmq3-dev
  
  # Install LaTeXML-Plugin-Cortex's master branch via cpanminus
  