The one in tree is from 2007, note the new URL and the license is CDDL v1.1 and GPL v2.
+*xmlstreambuffer-1.5.3 (17 Aug 2014) + + 17 Aug 2014; Johann Schmitz <ercpe@gentoo.org> +xmlstreambuffer-1.5.3.ebuild: + Version bump as per #518856