anchor.diff:  # RUN su - postgres -c "createuser -s discourse"
   
   # Install Ruby 2.0.0 (not bothering to use RVM)
  -RUN add-apt-repository ppa:brightbox/ruby-ng-experimental 
  -RUN apt-get -qy update
  +RUN add-apt-repository ppa:brightbox/ruby-ng-experimental  && apt-get -qy update
   RUN apt-get -qy install ruby2.0 ruby2.0-dev
   
   RUN echo "gem: --no-ri --no-rdoc" > ~/.gemrc
  
positive.code: # https://github.com/discourse/discourse/blob/master/docs/INSTALL-ubuntu.md
  #
  
  RUN echo "deb http://archive.ubuntu.com/ubuntu precise main universe" > /etc/apt/sources.list
  RUN apt-get -qy update
  RUN apt-get -qy install build-essential libssl-dev libyaml-dev git libtool libxslt-dev libxml2-dev libpq-dev gawk curl pngcrush python-software-properties
  
  # nginx
  # TODO: move to different container?
  RUN apt-get remove '^nginx.*$'
  
  RUN echo "deb http://nginx.org/packages/ubuntu/ precise nginx" >> /etc/apt/sources.list
  RUN echo "deb-src http://nginx.org/packages/ubuntu/ precise nginx" >> /etc/apt/sources.list
  RUN curl http://nginx.org/keys/nginx_signing.key | apt-key add -
  
  RUN apt-get -qy update
  RUN apt-get -qy install nginx
  
  
  # Discourse setup
  #
  
negative.code: 
  ADD	. /discourse/docker/
  RUN	chmod +x /discourse/docker/*
  # EXPOSE :3000
  