anchor.diff:      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 && \
  
positive.code: # 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
  
  
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 \
  