3.7.4 is an unstable version and should not go to official repos. And related to the automake 1.13 and gnome-common, see https://bugs.archlinux.org/task/33285 (there is a patch in there).
2013/1/27 Limao Luo email@example.com:
Hi TU's, I'm writing to let you guys know that extra/gnome-common has been out-of-date for a couple of weeks. I would really appreciate anyone updating it to 3.7.4 (it's currently 3.6.0) so that autoconf 2.13 plays well with the gnome-autogen.sh script that is a part of this package; several of my packages (e.g. rhythmbox-git, gmpc-git, gnome-doc-utils-git) don't build atm because of this, because the old script only checks up to autconf version 2.12.
Thanks in advance. -luolimao