gentoo-overlay/mail-client/balsa/metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
	<herd>gnome</herd>
	<use>
		<flag name='crypt'>Adds support for GnuPG encryption</flag>
		<flag name='gtkhtml'>Use gtkhtml for HTML rendering</flag>
		<flag name='gtkspell'>Use gtkspell for dictionary support</flag>
		<flag name='rubrica'>Adds support for <pkg>app-office/rubrica</pkg>
			addressbook</flag>
	</use>
</pkgmetadata>