gentoo-overlay/virtual/linux-sources/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<maintainer type="person">
		<email>blueness@gentoo.org</email>
		<name>Anthony G. Basile</name>
	</maintainer>
	<maintainer type="project">
		<email>kernel@gentoo.org</email>
		<name>Gentoo Kernel Project</name>
	</maintainer>
	<use>
		<flag name="firmware">Install linux kernel firmware</flag>
	</use>
</pkgmetadata>