anchor.diff:  # Haskell
   RUN apt-get install -y ghc ghc-doc cabal-install haskell-doc llvm
   
  -# shellshock
  -# TODO: move upward if other things at the top of this file have changed
  -RUN sudo apt-get update; sudo apt-get install bash
  -
   # apt-file cache
   RUN apt-file update
   
  
positive.code:     sudo -i -u ubuntu HOME=/home/ubuntu bash -i /etc/bash_completion && \
      HOME=/root bash -l /etc/bash_completion
  
  ADD ./files/etc /etc
  ADD ./files/home/ubuntu /tmp/homedir
  RUN cp /tmp/homedir/.gitignore /tmp/homedir/.hgignore && \
      mkdir -p /tmp/homedir/lib/apache2/lock /tmp/homedir/lib/apache2/log /tmp/homedir/lib/apache2/run && \
  
negative.code: 
  # servers
  RUN apt-get install -y redis-server redis-tools nginx postgresql-9.3 phppgadmin
  RUN apt-get install -y mysql-server rabbitmq-server couchdb
  
  # tools
  RUN apt-get install -y dnsutils bash-completion xsltproc \
  