anchor.diff:  		python \
   		python-pip \
   		ruby \
  +		ruby-bundler \
   		ruby-dev \
   		zlib1g-dev \
   	&& \
  -	gem install --no-ri --no-rdoc \
  -		gollum \
  -		github-markdown \
  -	&& \
  +	bundle install && \
   	pip install docutils && \
   	apt-get -y remove \
   		build-essential \
  
positive.code: FROM debian:buster
  LABEL maintainer="joelnbarnham@gmail.com"
  
  RUN \
  	export DEBIAN_FRONTEND=noninteractive && \
  
negative.code: 	:
  
  USER gollum
  # Temporary fix for https://github.com/gollum/gollum/issues/1699 until new gollum release
  CMD ["ruby", "-Eutf-8", "/usr/local/bin/gollum", "--mathjax", "--port", "4567", "--css"]
  