gentoo-overlay/sys-apps/acl/metadata.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE pkgmetadata SYSTEM 'http://www.gentoo.org/dtd/metadata.dtd'>
<pkgmetadata>
<herd>base-system</herd>
<use>
	<flag name='nfs'>add support for NFS acls</flag>
</use>
<upstream>
	<remote-id type='cpe'>cpe:/a:xfs:acl</remote-id>
</upstream>
</pkgmetadata>