libxml2-2.9.0 has API changes that break some of the packages depending on it. See https://mail.gnome.org/archives/xml/2012-August/msg00005.html and https://mail.gnome.org/archives/desktop-devel-list/2012-August/msg00004.html Please do not comment here with specific issues; instead, file separate bugs and have them block this one.
Marking as fixed since bug #449352 is now fixed.