anchor.diff:    # Android development
     programs.adb.enable = true;
   
  +  # Printing
  +  services.printing.enable = true;
  +  services.printing.drivers = [ pkgs.gutenprint ];
  +
  +  # Scanning
  +  hardware.sane.enable = true;
  +
     services = {
       mingetty.greetingLine = ''[[[ \l @ \n (\s \r \m) ]]]''; # getty message
       gpm.enable = true;
  -    printing.enable = true;
  -    printing.drivers = [ pkgs.gutenprint ];
       avahi.enable = true;
       kmscon.enable = true;
       kmscon.hwRender = true;
  
positive.code:           "wheel"
            "users"
            "networkmanager"
            "docker"
            "adbusers"
          ];
  
negative.code:           "wheel"
            "users"
            "networkmanager"
            "scanner"
            "lp"
            "docker"
            "adbusers"
          ];
  