{ config, lib, pkgs, ... }: { options.chvp.eid.enable = lib.mkOption { default = false; example = true; }; config = lib.mkIf config.chvp.eid.enable { environment.systemPackages = [ pkgs.eid-mw ]; services.pcscd = { enable = true; plugins = [ pkgs.ccid ]; }; }; }