gentoo-overlay/gnome-extra/evolution-data-server/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="api-doc-extras">Build documentation for private APIs</flag>
		<flag name="gnome-online-accounts">Enable using
			<pkg>net-libs/gnome-online-accounts</pkg> for authorization</flag>
		<flag name="vala">Build <pkg>dev-lang/vala</pkg> bindings</flag>
		<flag name="weather">Enable optional weather calendar support</flag>
	</use>
</pkgmetadata>