MarsSeed [1] filed a deletion request for netctl-gui-qt4 [2]: Broken, abandoned KDE4 package from 2016.
The core packages of the KDE4 desktop environment are no longer available in Arch/AUR repos, so this package is missing some of its dependencies. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/netctl-gui-qt4/
