gentoo-overlay/media-libs/gegl/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<!-- maintainer-needed -->
	<use>
		<flag name="lensfun">Enable support for <pkg>media-libs/lensfun</pkg>.</flag>
		<flag name="umfpack">Enable sparse solving via <pkg>sci-libs/umfpack</pkg>.</flag>
	</use>
</pkgmetadata>