As a followup to the discussion of glib-or-gtk-build-system building out-of-source by default, and whether or not it should be the default, I've pushed a wip-glib-or-gtk branch to Savannah. It changes the glib-or-gtk-build-system to build "in-source" by default. Can we schedule it for evaluation on either Hydra or Berlin, in order to test it? https://git.savannah.gnu.org/cgit/guix.git/commit/?h=wip-glib-or-gtk