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: ENV DEBIAN_FRONTEND noninteractive
  
  # increment version to force flushing the cache
  RUN echo "Version 1.8"
  
  ADD ./files/etc /etc
  
  RUN apt-get update --fix-missing && apt-get -y dist-upgrade
  RUN apt-get install -y bash console-setup sudo wget curl git python software-properties-common man-db && \
  
negative.code:     && php5enmod c9 \
      && apt-get install -y php5-dev \
          && pecl install xdebug \
          && php5enmod xdebug \
      && apt-get install -y apache2 apache2-doc phpmyadmin \
      && cd /etc/php5/mods-available && ls *.ini | sed 's/\.ini$//' | xargs php5enmod \
          && curl -sS https://getcomposer.org/installer | php \
  