opus' shared lib version has been bump'd, there was even a commit to bump the depending ports. However the commiter didn't update the plist to reflect the new lib version.
Fix: See attached patch
Patch attached with submission follows:
How-To-Repeat: cd /usr/ports/audio/opus && make package install
Over to maintainer (via the GNATS Auto Assign Tool)
Mea culpa. Committed, thanks!