--- pcsc-lite-1.8.22.ebuild	2018-06-04 19:38:18.309183494 +0200
+++ pcsc-lite-1.8.22.ebuild.usb	2018-06-04 19:37:37.363558690 +0200
@@ -49,9 +49,8 @@
 pkg_setup() {
 	use python && python-single-r1_pkg_setup
 	enewgroup openct # make sure it exists
+	enewgroup usb # make sure it exists
 	enewgroup pcscd
-	enewuser pcscd -1 -1 /run/pcscd pcscd,openct
+	enewuser pcscd -1 -1 /run/pcscd pcscd,openct,usb
 }
 
 multilib_src_configure() {