anchor.diff:      file \
       git \
       icu-libs \
  -    imagemagick@edge \
  +    imagemagick \
       libidn \
       libpq \
  -    nodejs-npm@edge \
  -    nodejs@edge \
  +    nodejs-npm \
  +    nodejs \
       protobuf \
       su-exec \
       tini \
  -    yarn@edge \
  +    yarn \
    && update-ca-certificates \
    && wget -O libiconv.tar.gz "http://ftp.gnu.org/pub/gnu/libiconv/libiconv-$LIBICONV_VERSION.tar.gz" \
    && echo "$LIBICONV_DOWNLOAD_SHA256 *libiconv.tar.gz" | sha256sum -c - \
  
positive.code: 
  WORKDIR /mastodon
  
  RUN echo "@edge https://nl.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories \
   && echo "@edge https://nl.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories \
   && apk -U upgrade \
   && apk add -t build-dependencies \
      build-base \
      icu-dev \
  
negative.code: FROM ruby:2.4.1-alpine3.6
  
  LABEL maintainer="https://github.com/tootsuite/mastodon" \
        description="A GNU Social-compatible microblogging server"
  