Bug 267957 is still not fixed in 2.26.3. I can't reopen it.
the bug is solved for stabilization purpose. There is an upstream bug about fixing gtk-doc/gnome-keyring to not source libraries from the system but from the sandbox as it should. For unstable users, everything is described in bug #267957. There is nothing else to do here, thanks. *** This bug has been marked as a duplicate of bug 267957 ***