anchor.diff:    BACKUP_DATA_DIR=/var/lib/backups
   
   # Install base packages.
  -RUN \
  -  apt-get update && \
  -  apt-get -y install \
  -    build-essential \
  -    cron \
  -    curl \
  -    git \
  -    inotify-tools \
  -    libcurl4-openssl-dev \
  -    libreadline6-dev \
  -    libssl-dev \
  -    libsqlite3-dev \
  -    libxml2-dev \
  -    libxslt1-dev \
  -    libyaml-dev \
  -    mysql-client \
  -    nano \
  -    python \
  -    python-setuptools \
  -    sqlite3 \
  -    wget \
  -    zlib1g-dev
  +RUN apt-get update && apt-get -y install \
  +  build-essential \
  +  cron \
  +  curl \
  +  git \
  +  inotify-tools \
  +  mysql-client \
  +  nano \
  +  python \
  +  python-setuptools \
  +  sqlite3 \
  +  wget
   
   # Install supervisord using easy install.
   RUN easy_install supervisor
  
positive.code:   make install && \
    cd .. && \
    rm -rf redis-*
  
  # Compile ruby from source.
  RUN \
    cd /tmp && \
    wget http://ftp.ruby-lang.org/pub/ruby/2.2/ruby-2.2.0.tar.gz && \
    tar -xzvf ruby-*.tar.gz && \
    rm -f ruby-*.tar.gz && \
    cd ruby-* && \
    ./configure --enable-shared --disable-install-doc && \
    make && \
    make install && \
    cd .. && \
    rm -rf ruby-*
  
  # Clean up APT when done.
  RUN apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
  
negative.code: # Compile redis from official source
  RUN \
    cd /tmp && \
    wget http://download.redis.io/redis-stable.tar.gz && \
    tar -xzvf redis-*.tar.gz && \
    rm -f redis-*.tar.gz && \
    cd redis-* && \
  