anchor.diff:  FROM tianon/debian:wheezy
   MAINTAINER Nat Welch <nat@natwelch.com>
   
  +# Install all of the packages
   ENV DEBIAN_FRONTEND noninteractive
   RUN echo 'deb http://gce_debian_mirror.storage.googleapis.com/ wheezy main contrib non-free' > /etc/apt/sources.list
   RUN apt-key update
  
positive.code: ENV LANG en_US.UTF-8
  ENV LC_ALL en_US.UTF-8
  
  RUN mkdir -p /opt/ruby && cd /opt/ruby && curl --progress ftp://ftp.ruby-lang.org/pub/ruby/ruby-2.0.0-p353.tar.gz | tar xz
  RUN cd /opt/ruby/ruby* && ./configure && make && make install
  RUN echo "gem: --no-ri --no-rdoc" > /root/.gemrc
  RUN gem install bundler
  
  RUN echo " IdentityFile ~/.ssh/id_rsa" >> /etc/ssh/ssh_config
  RUN mkdir -p /root/.ssh
  RUN ssh-keyscan -t rsa,dsa github.com | sort -u > /root/.ssh/known_hosts
  
negative.code: ADD packages.txt /tmp/
  RUN apt-get -qy install `cat /tmp/packages.txt`
  
  # Configure Language Environment
  RUN apt-get install -y locales
  ADD locale.gen /etc/locale.gen
  RUN locale-gen
  