The pidgin-sipe version 1.18.0 is out. To get it, just do: cp /usr/portage/x11-plugins/pidgin-sipe/pidgin-sipe-1.17.3.ebuild /usr/portage/x11-plugins/pidgin-sipe/pidgin-sipe-1.18.0.ebuild It's exactly the same ebuild.
Already in portage: http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/x11-plugins/pidgin-sipe/pidgin-sipe-1.18.0.ebuild?revision=1.1&view=markup