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This has some API changes that break <evolution-data-server-3.6. See https://mail.gnome.org/archives/desktop-devel-list/2012-August/msg00004.html
(In reply to comment #1) > This has some API changes that break <evolution-data-server-3.6. See > https://mail.gnome.org/archives/desktop-devel-list/2012-August/msg00004.html feel free to use package.mask
libxml2-2.9.0 has been added to portage, masked for now due to API changes that break a evolution-data-server and gnome-online-accounts in <gnome-3.6. >*libxml2-2.9.0 (27 Nov 2012) > > 27 Nov 2012; Alexandre Rostovtsev <tetromino@gentoo.org> > +libxml2-2.9.0.ebuild, +files/libxml2-2.9.0-disable_static_modules.patch, > +files/libxml2-2.9.0-large-file-parse.patch, > +files/libxml2-2.9.0-nsclean.patch, +files/libxml2-2.9.0-rand_seed.patch, > +files/libxml2-2.9.0-streaming-validation.patch, > +files/libxml2-2.9.0-thread-alloc.patch, > +files/libxml2-2.9.0-thread-portability.patch: > Version bump featuring improved push parser and XPath evaluation (bug > #444290). Update to EAPI5, always install docs in a devhelp-compatible > location following current gnome team style guidelines, and run a more > complete test suite.