gentoo-overlay/sys-auth/consolekit/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<herd>freedesktop</herd>
<use>
	<flag name="policykit">
	Use the PolicyKit framework (<pkg>sys-auth/polkit</pkg>) to get
	authorization for suspend/shutdown.
	</flag>
</use>
</pkgmetadata>