anchor.diff:   && DEBIAN_FRONTEND=noninteractive apt-get -y update \
    && apt-get build-dep -y -q nginx \
    && apt-get install -y -q nginx \
  + && apt-mark hold nginx \
    && cd /usr/src/nginx; apt-get source -q -y nginx \
    && cd /usr/src/nginx/nginx-*/ \
    && ./configure \
  
positive.code: ADD ./config/php5/fpm/pool.d/www2.conf /etc/php5/fpm/pool.d/www2.conf
  ADD ./config/php5/mods-available/opcache.ini /etc/php5/mods-available/opcache.ini
  ADD ./config/exim4/update-exim4.conf.conf /etc/exim4/update-exim4.conf.conf
  ADD ./config/ssh/sshd_config /etc/ssh/sshd_config
  
  RUN update-exim4.conf \
   && DEBIAN_FRONTEND=newt
  
negative.code: FROM rpawel/ubuntu:trusty
  
  RUN apt-get -q -y update \
   && apt-get dist-upgrade -y --no-install-recommends \
  # Nginx + Google Pagespeed
   && DEBIAN_FRONTEND=noninteractive apt-get install -y -q make build-essential g++ \
   && wget -q http://nginx.org/keys/nginx_signing.key -O- | apt-key add - \
   && add-apt-repository -y "deb http://nginx.org/packages/ubuntu/ $(lsb_release -sc) nginx" \
   && NPS_VERSION=1.9.32.4 \
   && mkdir -p /usr/src/nginx && cd /usr/src/nginx && wget -q https://github.com/pagespeed/ngx_pagespeed/archive/v${NPS_VERSION}-beta.zip \
   && unzip v${NPS_VERSION}-beta.zip && cd /usr/src/nginx/ngx_pagespeed-${NPS_VERSION}-beta/ \
   && /bin/bash scripts/pagespeed_libraries_generator.sh > /usr/src/nginx/pagespeed_libraries.conf \
  