gentoo-overlay/x11-wm/metacity/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="libcanberra">Enable sound event support using <pkg>media-libs/libcanberra</pkg></flag>
	<flag name="vulkan">Enable Vulkan based compositor support via META_COMPOSITOR=vulkan environment variable</flag>
</use>
</pkgmetadata>