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{ config, pkgs, lib, ... }: with lib; let cfg = config.programs.usbtop; in { options = { programs.usbtop.enable = mkEnableOption (lib.mdDoc "usbtop and required kernel module"); }; config = mkIf cfg.enable { environment.systemPackages = with pkgs; [ usbtop ]; boot.kernelModules = [ "usbmon" ]; }; }