anchor.diff:  
   ####################################
   
  -FROM alpine:3.7 as builder
  +FROM alpine:3.10 as builder
   
   ENV LANGUAGE en_US.UTF-8
   ENV LANG en_US.UTF-8
  
positive.code:     ruby-dev \
      ruby-rdoc \
      ruby-irb \
      gcc \
      make \
      libc-dev \
  
negative.code:     build-base
  
  RUN apk add --no-cache $BUILD_PACKAGES \
      && gem update --system \
      && rm /usr/bin/bundle \
      && gem install bundler
  
  WORKDIR /jekyll
  ADD Gemfile Gemfile.lock ./
  RUN bundle install
  
  ADD . .
  ARG JEKYLL_BASEURL
  RUN bundle exec jekyll build --baseurl $JEKYLL_BASEURL
  
  ####################################
  
  