gentoo-overlay/gnome-base/nautilus/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<herd>gnome</herd>
<use>
	<flag name="packagekit">Use packagekit to search for programs to open
		unknown file types</flag>
	<flag name="previewer">Use <pkg>gnome-extra/sushi</pkg> to preview files
		from the file mananger</flag>
	<flag name="sendto">Enable the nautilus-sendto extension to send files to
		various locations/devices</flag>
	<flag name="tracker">Add support for <pkg>app-misc/tracker</pkg> search</flag>
</use>
</pkgmetadata>