bionade24 [1] filed a request to merge ros-melodic-opencv3 [2] into opencv3-opt [3]:
This package has no package depending on it anymore and was replaced by opencv3-opt [1] https://aur.archlinux.org/account/bionade24/ [2] https://aur.archlinux.org/pkgbase/ros-melodic-opencv3/ [3] https://aur.archlinux.org/pkgbase/opencv3-opt/
