anchor.diff: -FROM alpine:latest as boringssl-builder
  +FROM alpine:edge as boringssl-builder
   RUN apk update && apk upgrade && apk add cmake gcc g++ git go ninja perl
   RUN mkdir /usr/src && git clone https://boringssl.googlesource.com/boringssl /usr/src/boringssl \
    && cd /usr/src/boringssl && git reset --hard e58f8a6b9ab6e990f0c273552f7b1411a3c6b0bc
  
positive.code: RUN mkdir build && cd build && cmake -GNinja -DCMAKE_BUILD_TYPE=Release ..
  RUN cd build && ninja run_tests
  
  FROM alpine:latest as nginx-builder
  RUN apk update && apk upgrade && apk add curl gcc gnupg make musl-dev pcre-dev zlib-dev
  ENV NGINX_VERSION="1.13.5"
  WORKDIR /usr/src
  
negative.code:  && objcopy --add-gnu-debuglink=nginx.debug nginx \
   && mv nginx.debug /usr/lib/debug/usr/sbin/ && strip /usr/sbin/nginx
  
  FROM alpine:edge
  COPY --from=nginx-builder /usr/sbin/nginx /usr/sbin/
  COPY --from=nginx-builder /usr/lib/debug/usr/sbin/nginx.debug /usr/lib/debug/usr/sbin/
  COPY --from=nginx-builder /etc/nginx/* /etc/nginx/
  