anchor.diff:      tar -zxvf fzf-0.17.4-linux_amd64.tgz && \
       mv fzf /usr/local/bin/fzf && \
       rm fzf-0.17.4-linux_amd64.tgz && \
  +# Install exa
  +    wget https://github.com/ogham/exa/releases/download/v0.8.0/exa-linux-x86_64-0.8.0.zip && \
  +    unzip exa-linux-x86_64-0.8.0.zip && \
  +    mv exa-linux-x86_64 /usr/local/bin/exa && \
  +    rm exa-linux-x86_64-0.8.0.zip && \
   # Fix for occasional errors in perl stuff (git, ack) saying that locale vars
   # aren't set.
       apt-get install -y locales &&\
  
positive.code:     homesick symlink zshfiles &&\
  # Set up The Editor of the Gods
      homesick clone dpetersen/vimfiles &&\
      homesick symlink vimfiles &&\
      cd ~/.vim/bundle_storage/vimproc.vim && make
  
  # Expose SSH
  EXPOSE 22
  
negative.code:     gem install github-auth --no-document &&\
  # Install zsh
      apt-get install -y zsh &&\
  # Install searching tools
      apt-get install -y ack-grep &&\
      curl -LO https://github.com/BurntSushi/ripgrep/releases/download/0.10.0/ripgrep_0.10.0_amd64.deb && \
      dpkg -i ripgrep_0.10.0_amd64.deb && \
      rm ripgrep_0.10.0_amd64.deb && \
  # Set up SSH. We set up SSH forwarding so that transactions like git pushes
  # from the container happen magically.
      apt-get install -y openssh-server &&\
  