m-pilia [1] filed a deletion request for itk-snap [2]: Package that depends on obsolete versions of dependencies and can no longer be built on an up-to-date arch linux. The project is basically abandoned judging from the git log, so no realistic hope of fixing this upstream.
[1] https://aur.archlinux.org/account/m-pilia/ [2] https://aur.archlinux.org/pkgbase/itk-snap/
