anchor.diff:  
   # INI directory
   ENV PHP_INI_DIR '/usr/local/etc/php/conf.d'
  +
  +# server_env
  +ENV server_env dev
   
   # Extensions and ini settings
   RUN curl -L http://pecl.php.net/get/xdebug-2.4.0RC2.tgz > /usr/src/php/ext/xdebug.tgz \
  
positive.code:         libpng12-dev \
          libbz2-dev \
          libaio1 \
          rsync \
          rsyslog \
          sudo \
  
negative.code:         unzip \
          wget \
          vim \
      && npm install -g gulp-cli \
      && npm install -g grunt-cli \
      && apt-get clean \
      && rm -rf /var/lib/apt/lists/*
  
  