gentoo-overlay/app-pda/gtkpod/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<!-- maintainer-needed -->
	<use>
		<flag name="clutter">Enable clutter support for displaying coverart</flag>
	</use>
	<upstream>
		<remote-id type="sourceforge">gtkpod</remote-id>
	</upstream>
</pkgmetadata>