anchor.diff:  #   libfontconfig1 for PhantomJS
   #   ttf-bitstream-vera for a2png
   #   libpng16-16 for pngquant
  -
  -# install Bundler and SASS
  -
  -RUN gem install bundler sass
   
   # install Hex and Rebar
   
  
positive.code: 
  RUN apt-get update && \
      apt-get install -y wget software-properties-common apt-transport-https && \
      add-apt-repository ppa:brightbox/ruby-ng && \
      echo "deb https://deb.nodesource.com/$NODE_VERSION $DISTRO main" >/etc/apt/sources.list.d/nodesource.list && \
      echo "deb https://packages.erlang-solutions.com/ubuntu $DISTRO contrib" >/etc/apt/sources.list.d/esl.list && \
      wget --quiet -O - https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add - && \
  
negative.code:       build-essential \
        elixir=1.6.3-1 \
        esl-erlang=1:20.1 \
        libfontconfig1 \
        libpng16-16 \
        nodejs \
        ttf-bitstream-vera \
        tzdata
  
  