MarsSeed [1] filed a deletion request for ros-melodic-webkit- dependency [2]: Dead, abandoned package. EOL since 2020. [a] The current pkgver=1.1.0 is for a 2017 release. [b] The actually required qt5-webkit and python-pyqt5-webkit are not defined as explicit dependencies, therefore they are missing when trying to build this without modifications. [a]: https://github.com/ros-visualization/webkit_dependency [b]: https://github.com/ros-visualization/webkit_dependency/tags [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/ros-melodic-webkit-dependency/