Created attachment 197249 [details] patch USES=compiler:c++11-lang and USE_CXXSTD=c++11 are needed to fix build on architectures that use GCC as cc. Tested on CURRENT with powerpc64 and amd64.
I've already tested the patch, it is in my commit queue.
A commit references this bug: Author: linimon Date: Fri Sep 21 11:33:10 UTC 2018 New revision: 480257 URL: https://svnweb.freebsd.org/changeset/ports/480257 Log: Fix build on gcc-based archs. PR: 231497 Submitted by: Piotr Kubaj Approved by: portmgr (tier-2 blanket) Changes: head/devel/avro-cpp/Makefile