gentoo-overlay/gnome-extra/gnome-software/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<maintainer type="project">
		<email>gnome@gentoo.org</email>
		<name>Gentoo GNOME Desktop</name>
	</maintainer>
	<use>
		<flag name="firmware">Enable firmware update support through <pkg>sys-apps/fwupd</pkg></flag>
		<flag name="flatpak">Enable support for flatpak applications using <pkg>sys-apps/flatpak</pkg></flag>
		<flag name="packagekit">Enable module for package manager integration</flag>
		<flag name="sysprof">Enable profiling data capture support using <pkg>dev-util/sysprof-capture</pkg></flag>
	</use>
</pkgmetadata>