--- /usr/portage/sys-auth/rtkit/rtkit-0.11-r1.ebuild	2015-08-10 04:34:55.000000000 +0800
+++ rtkit-0.11-r1.ebuild	2016-02-22 22:37:59.497839608 +0800
@@ -3,7 +3,7 @@
 # $Id$
 
 EAPI=5
-inherit eutils systemd user autotools
+inherit eutils systemd user autotools linux-info
 
 DESCRIPTION="Realtime Policy and Watchdog Daemon"
 HOMEPAGE="http://0pointer.de/blog/projects/rtkit"
@@ -23,6 +23,16 @@
 	app-arch/xz-utils
 "
 
+pkg_pretend() {
+	if use kernel_linux; then
+		CONFIG_CHECK="~!RT_GROUP_SCHED"
+		ERROR_RT_GROUP_SCHED="CONFIG_RT_GROUP_SCHED is enabled. rtkit-daemon (or any other "
+		ERROR_RT_GROUP_SCHED+="real-time task) will not work unless run as root. Please consider "
+		ERROR_RT_GROUP_SCHED+="unsetting this option."
+		check_extra_config
+	fi
+}
+
 pkg_setup() {
 	enewgroup rtkit
 	enewuser rtkit -1 -1 -1 "rtkit"