The gtk use flag must be enabled, otherwise pkg-config will fail.
+*gnome-keyring-3.8.1 (28 Apr 2013) + + 28 Apr 2013; Pacho Ramos <pacho@gentoo.org> +gnome-keyring-3.8.1.ebuild, + -gnome-keyring-3.6.2.ebuild: + Version bump, use fcaps.eclass (#454908 by SpanKY), fix dependencies (#467416 + by Tolga Dalman), drop unexisting configure options. Drop old +