anchor.diff:      ca-certificates \
       # cURL and Wget
       curl \
  +    curl-doc \
       wget \
  +    wget-doc \
       # Docker client
       docker \
  +    docker-doc \
       # Build essentials
       g++ \
       make \
       # Git, Neovim, Ag, tmux, ZSH
       git \
  +    git-doc \
       neovim \
       neovim-doc \
       the_silver_searcher \
  +    the_silver_searcher-doc \
       tmux \
  +    tmux-doc \
       zsh \
  +    zsh-doc \
       zsh-vcs \
       # GNU tools
       gnupg \
  +    gnupg-doc \
       less \
  +    less-doc \
       # inotify interface for filesystem events
       inotify-tools \
       # ping, tracetoute, etc.
  
positive.code:     mdocml-apropos \
      # OpenSSH client and server
      openssh \
      # Python 2 and 3
      python2 \
      python2-dev \
  
negative.code:     py2-pip \
      # sudo for runtime everyday use only, do not use in build time
      sudo \
      sudo-doc \
      # Timezone database
      tzdata && \
    # Update ca certificates
  