anchor.diff:      echo "host_list=(dev)" >> /usr/local/etc/wemux.conf &&\
   
   # Install neovim
  -    add-apt-repository ppa:neovim-ppa/unstable &&\
  -    apt-get update &&\
  -    apt-get install neovim &&\
  +    apt-get install -y neovim &&\
   
   # Install Homesick, through which zsh and vim configurations will be installed
       apt-get install -y ruby &&\
  
positive.code: FROM ubuntu:15.10
  MAINTAINER Don Petersen <don@donpetersen.net>
  
  # Start by changing the apt output, as stolen from Discourse's Dockerfiles.
  
negative.code: 
  # Fix for occasional errors in perl stuff (git, ack) saying that locale vars
  # aren't set.
      apt-get install -y locales &&\
      locale-gen --purge en_US.UTF-8 &&\
      update-locale LANG=en_US.UTF-8
  
  RUN useradd dev -d /home/dev -m -s /bin/zsh &&\
      adduser dev sudo && \
  