anchor.diff:    && mkdir -p /tmp/src \
     && cd /tmp/src \
     && wget http://nginx.org/download/nginx-${NGINX_VERSION}.tar.gz \
  +  && wget http://nginx.org/download/nginx-${NGINX_VERSION}.tar.gz.asc \
  +  && gpg --keyserver pgpkeys.mit.edu --recv-key A1C052F8 \
  +  && gpg --verify nginx-${NGINX_VERSION}.tar.gz.asc nginx-${NGINX_VERSION}.tar.gz \
     && tar -zxvf nginx-${NGINX_VERSION}.tar.gz \
     && cd nginx-${NGINX_VERSION} \
     && ./configure \
  
positive.code: MAINTAINER Dominique HAAS <contact@dominique-haas.fr>
  
  ENV NGINX_VERSION 1.9.12
  
  RUN \
    build_pkgs="build-base linux-headers openssl-dev pcre-dev wget zlib-dev" \
  
negative.code:   && adduser -D www-data
  
  # forward request and error logs to docker log collector
  RUN ln -sf /dev/stdout /var/log/nginx/access.log \
      && ln -sf /dev/stderr /var/log/nginx/error.log
  
  VOLUME ["/var/log/nginx"]
  
  