anchor.diff:      && cd /tmp/phantomjs \
       && mv bin/phantomjs /usr/local/bin
   
  +ENV MJML_VERSION 3.3.3
  +RUN npm install -g mjml@${MJML_VERSION}
  +
   # Clean up APT when done.
   RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
   
  -ENV MJML_VERSION 3.3.3
  -RUN npm install -g mjml@${MJML_VERSION}
  
positive.code:     ln -s /usr/local/bin/node /usr/local/bin/nodejs
  
  # Ruby
  RUN apt-get install -y curl patch gawk g++ gcc make libc6-dev patch libreadline6-dev zlib1g-dev libssl-dev libyaml-dev libsqlite3-dev sqlite3 autoconf libgdbm-dev libncurses5-dev automake libtool bison pkg-config libffi-dev
  RUN gpg --keyserver hkp://keys.gnupg.net --recv-keys D39DC0E3
  RUN /bin/bash -l -c "curl -L get.rvm.io | bash -s stable"
  RUN /bin/bash -l -c "rvm install 2.1"
  
negative.code: MAINTAINER ductamnguyen@anduintransact.com
  
  RUN groupadd -r anduin && useradd -g anduin anduin
  
  # Yarn
  RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add - && \
  echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list
  
  # Nodejs
  ENV NODE_VERSION v6.10.0
  