anchor.diff:  
   RUN NPS_VERSION=1.9.32.3 \
       PCRE_VERSION=8.37 \
  -    NGINX_VERSION=1.9.1 \
  +    NGINX_VERSION=1.9.2 \
       ZLIB_VERSION=1.2.8 \
       OPENSSL_VERSION=1_0_2a \
       NGINX_LOG_PATH=/var/log/nginx \
  
positive.code:         -C ${TMP_DIR} &&\
      curl -Ls https://github.com/openssl/openssl/archive/OpenSSL_${OPENSSL_VERSION}.tar.gz | tar -xzvf - \
          -C ${TMP_DIR} &&\
      cd ${TMP_DIR}/nginx-${NGINX_VERSION} &&\
      ./configure \
          --add-module=${TMP_DIR}/ngx_pagespeed-${NPS_VERSION}-beta \
          --conf-path=/etc/nginx/nginx.conf \
          --error-log-path=${NGINX_LOG_PATH}/error.log \
  
negative.code:         -C ${TMP_DIR} &&\
      curl -Ls https://dl.google.com/dl/page-speed/psol/${NPS_VERSION}.tar.gz | tar -xvzf - \
          -C ${TMP_DIR}/ngx_pagespeed-${NPS_VERSION}-beta --exclude=lib/Debug &&\
      curl -Ls https://github.com/nginx/nginx/archive/release-${NGINX_VERSION}.tar.gz | tar -xvzf - \
          -C ${TMP_DIR} &&\
      curl -Ls ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-${PCRE_VERSION}.tar.gz | tar -xvzf - \
          -C ${TMP_DIR} &&\
  