anchor.diff:  ENV DEBIAN_FRONTEND noninteractive
   
   # increment version to force flushing the cache
  -RUN echo "Version 1.8"
  -
  -ADD ./files/etc /etc
  +RUN echo "Version 1.9"
   
   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 && \
  
positive.code: #   http://docs.travis-ci.com/user/ci-environment/#Extensions
  #   https://devcenter.heroku.com/articles/php-support
  # Xdebug, most recent PECL version
  RUN apt-get install -y php5 php5-cli php5-fpm \
          php5-curl php5-gd php5-json php5-pgsql php5-readline php5-sqlite \
          php5-tidy php5-xmlrpc php5-xsl php5-intl php5-mcrypt php5-mysqlnd \
  
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 \
  