anchor.diff: -FROM ubuntu:16.10
  +FROM ubuntu:17.10
   MAINTAINER Michael Mior <michael.mior@gmail.com>
   
  -RUN locale-gen en_US.UTF-8
   ENV DEBIAN_FRONTEND=noninteractive
   RUN apt-get -qq update && \
       apt-get install -qq -o=Dpkg::Use-Pty=0 \
  
positive.code:       libtool \
        libyaml-dev \
        libxml2 \
        ncurses-dev \
        opam \
        openssl \
  
negative.code:       zlib1g-dev \
        zsh \
      > /dev/null && apt-get clean && rm -rf /var/lib/apt/lists/*
  RUN locale-gen en_US.UTF-8
  
  RUN useradd -s /bin/zsh tester
  ADD . /home/tester/.dotfiles
  