{pkgs, config, ...}: { ###### interface options = { networking.enableRT73Firmware = pkgs.lib.mkOption { default = false; type = pkgs.lib.types.bool; description = '' Turn on this option if you want firmware for the RT73 NIC ''; }; }; ###### implementation config = pkgs.lib.mkIf config.networking.enableRT73Firmware { hardware.firmware = [ pkgs.rt73fw ]; }; }