I'm amazed that the fix for the port multimedia/gstreamer1-plugins (and friends) failing to build for upgrade on #FreeBSD:

ld: error: undefined symbol: gst_udmabuf_allocator_get_type

...is still to uninstall it first, then install it anew:

make -C /usr/ports/multimedia/gstreamer1-plugins deinstall clean build install clean && pkg set -yA 1 gstreamer1-plugins