anchor.diff:  
     # Printing.
     services.printing.enable = true;
  -  services.printing.drivers = with pkgs; [ gutenprint gutenprintBin ];
  +  services.printing.drivers = with pkgs; [ gutenprint gutenprintBin hplip hplipWithPlugin ];
   
     # My users.
     security.sudo.enable = true;
  
positive.code:   nixpkgs.config = {
      allowUnfree = true;
    };
    environment.systemPackages = (with pkgs; [
      rsync openssh git neovim gnupg smartmontools qemu
      nmap tcpdump dnsutils
      file htop tree hexd pixd xsel maim xdotool rlwrap
      latinmodern-math lmodern gummi texlive.combined.scheme-full
      signal-desktop quasselClient
      gimp darktable krita 
      zeal mpv firefox
      mathematica
      python3 ghc jq dash nodejs racket
      virtualbox arduino
      nix-index
    ]) ++ (with pkgs.gnome3; [
      gnome-terminal gnome-disk-utility
      gnome-logs gnome-system-log
  
negative.code:     gnome-clocks gnome-weather
    ]);
  
    # RTL-SDR
    services.udev.packages = [ pkgs.rtl-sdr ];
  
    # Package comfort.
    nixpkgs.config.packageOverrides = pkgs: with pkgs; {
      neovim = neovim.override {
  