hcartiaux [1] filed an orphan request for netcalc [2]: User unreachable (invalid mail address) and inactive for a few years. PKGBUILD outdated despite a few remarks left a few years ago.
[1] https://aur.archlinux.org/account/hcartiaux/ [2] https://aur.archlinux.org/pkgbase/netcalc/
