anchor.diff:  ################################################################################
   # merge
   ################################################################################
  -FROM scratch
  +FROM system
   LABEL maintainer="fcwu.tw@gmail.com"
   
  -COPY --from=system / /
   COPY --from=builder /src/web/dist/ /usr/local/lib/web/frontend/
   COPY image /
   
  
positive.code: FROM ubuntu:16.04 as builder
  
  ARG localbuild
  RUN if [ "x$localbuild" != "x" ]; then sed -i 's#http://archive.ubuntu.com/#http://qnap.dorowu.com/#' /etc/apt/sources.list; fi
  
  RUN apt-get update \
      && apt-get install -y --no-install-recommends curl ca-certificates
  
negative.code: FROM ubuntu:16.04 as system
  
  ARG localbuild
  RUN if [ "x$localbuild" != "x" ]; then sed -i 's#http://archive.ubuntu.com/#http://tw.archive.ubuntu.com/#' /etc/apt/sources.list; fi
  
  # built-in packages
  RUN apt-get update \
  