gentoo-overlay/app-admin/gtkdiskfree/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<maintainer type="person" proxied="yes">
		<email>samuel.bauer@yahoo.fr</email>
		<name>Samuel Bauer</name>
	</maintainer>
	<maintainer type="project" proxied="proxy">
		<email>proxy-maint@gentoo.org</email>
		<name>Proxy Maintainers</name>
	</maintainer>
	<use>
		<flag name="gtk2">Support GTK+ 2.x instead of GTK+ 3.x</flag>
	</use>
</pkgmetadata>