===> Installing for qt5-multimedia-5.13.2
===> Checking if qt5-multimedia is already installed
===> Registering installation for qt5-multimedia-5.13.2 as automatic
pkg-static: Unable to access file /tmp/ports/usr/ports/multimedia/qt5-multimedia/work/stage/usr/local/lib/cmake/Qt5MultimediaGstTools/Qt5MultimediaGstToolsConfig.cmake:No such file or directory
pkg-static: Unable to access file /tmp/ports/usr/ports/multimedia/qt5-multimedia/work/stage/usr/local/lib/cmake/Qt5MultimediaGstTools/Qt5MultimediaGstToolsConfigVersion.cmake:No such file or directory
pkg-static: Warning: @exec is deprecated, please use @[pre|post][un]exec
*** Error code 74
Port configured without gstreamer support
I assume you have the option GSTREAMER set to off?
A commit references this bug:
Date: Sat Nov 9 08:54:36 UTC 2019
New revision: 517114
multimedia/qt5-multimedia: mask Gstreamer related cmake files in plist
Reported by: email@example.com
Should be fixed now.