The build fails with Clang 6 and soon the port will be marked as BROKEN on 12.0 and 11.2 if we do not act.
Created attachment 196538 [details] net__skstream.diff
A commit references this bug: Author: oliver Date: Sat Aug 25 18:59:30 UTC 2018 New revision: 478079 URL: https://svnweb.freebsd.org/changeset/ports/478079 Log: fix build on 11 PR: 230896 Submitted by: tobik Changes: head/net/skstream/Makefile
Thanks for taking care Tobias!