Jristz [1] filed a orphan request for xdelta [2]: Maintainer fal to se coments about the glib issue, also fail to track glib movements (glib is makedeps since forever and he never add it to the makedep)
so I think someone could do a better job or at less update acordly better. [1] https://aur.archlinux.org/account/Jristz/ [2] https://aur.archlinux.org/pkgbase/xdelta/
