gentoo-overlay/www-client/vimb/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="gtk3">Link against <pkg>x11-libs/gtk+</pkg>:3 instead of
			<pkg>x11-libs/gtk+</pkg>:2.</flag>
	</use>
	<upstream>
		<remote-id type="github">fanglingsu/vimb</remote-id>
	</upstream>
</pkgmetadata>