Created attachment 204413 [details] diff to astro/libkgeomap/Makefile astro/libkgeomap has dependency on libopencv_video.so:graphics/opencv, but it does not link this library. Doing grep -ir opencv to its source shows no result. So, I think this dependency can be removed.
A commit references this bug: Author: rakuco Date: Sun Oct 13 14:18:07 UTC 2019 New revision: 514393 URL: https://svnweb.freebsd.org/changeset/ports/514393 Log: Drop dependency on graphics/opencv. The source code does not use OpenCV anywhere, and apparently never has. PR: 237934 Submitted by: Hiroo Ono <hiroo.ono+freebsd@gmail.com> Changes: head/astro/libkgeomap/Makefile
Committed, thank you very much for the patch.