anchor.diff:          # required for PDF meta analysis
           poppler-utils \
           zlibc \
  -        # required for mermaid
  -        nodejs \
  -        yarn \
       # clean up
       && apt-get clean && \
       rm -rf /var/lib/apt/lists/* /etc/apt/apt.conf.d/01proxy
  
positive.code: ADD requirements.txt ./
  RUN pip3 --no-cache-dir install --find-links file://${PWD}/cache -r requirements.txt
  
  #
  # Mermaid
  #
  RUN yarn add mermaid.cli
  
  VOLUME /pandoc
  WORKDIR /pandoc
  ADD pandoc.sh /usr/local/bin
  
negative.code: ENV DEBCONF_NOWARNINGS yes
  
  #
  # Debian
  #
  RUN set -x && \
  