anchor.diff:  
             Service = {
               Type = "oneshot";
  -            ExecStart = "${pkgs.feh}/bin/feh --randomize --bg-${cfg.display} ${cfg.imageDirectory}";
  +            ExecStart = "${pkgs.feh}/bin/feh ${flags} ${cfg.imageDirectory}";
               IOSchedulingClass = "idle";
             };
   
  
positive.code: let
  
    cfg = config.services.random-background;
  
  in
  
  
negative.code:           as a duration understood by systemd.
          '';
        };
  
        enableXinerama = mkOption {
          default = true;
          type = types.bool;
          description = ''
            Will place a separate image per screen when enabled,
            otherwise a single image will be stretched across all
            screens.
          '';
        };
      };
    };
  
  