Created attachment 200510 [details] patch USES=compiler:c++11-lang is necessary to build on GCC architectures. Tested on powerpc64 and amd64. Hardware sponsored by IntegriCloud.
To me this fails on amd64 with: gmake[1]: *** No rule to make target 'avahi-qt5.pc'. Stop.
This now builds for me.
A commit references this bug: Author: linimon Date: Thu Mar 21 12:04:59 UTC 2019 New revision: 496445 URL: https://svnweb.freebsd.org/changeset/ports/496445 Log: Fix build on gcc-based architectures, with the false positive error: configure: error: Couldn't compile Qt without -fPIC nor with -fPIC PR: 234406 Submitted by: Piotr Kubaj Approved by: portmgr (tier-2 blanket) Changes: head/net/avahi-qt5/Makefile