anchor.diff:    && apt-get install --assume-yes \
       libreadline-dev \
       libssl-dev \
  -  && curl https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0.tar.bz2 \
  +  && curl https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.1.tar.bz2 \
       | tar xj \
     && cd $(ls -d ruby-* | head -n 1) \
     && ./configure \
  
positive.code:   && apt-get install --assume-yes \
      libpam-dev \
      ucspi-tcp \
    && curl https://mmonit.com/monit/dist/monit-5.21.0.tar.gz \
      | tar xz \
    && cd $(ls -d monit-* | head -n 1) \
    && ./configure \
  
negative.code:     libjemalloc-dev \
      libncurses-dev \
      python-docutils \
    && curl https://repo.varnish-cache.org/source/varnish-5.1.2.tar.gz \
      | tar xz \
    && cd $(ls -d varnish-* | head -n 1) \
    && ./configure \
  