Created attachment 200525 [details] patch USES=compiler:c++11-lang is necessary to build on GCC architectures. Tested on powerpc64 and amd64. Hardware sponsored by IntegriCloud.
The patch works fine for me on amd64 and i386. I'm unable at present to test on other architectures, so I approve it.
A commit references this bug: Author: madpilot Date: Sun Dec 30 11:24:58 UTC 2018 New revision: 488707 URL: https://svnweb.freebsd.org/changeset/ports/488707 Log: USES=compiler:c++11-lang is necessary to build on GCC architectures. PR: 234414 Submitted by: Piotr Kubaj <pkubaj@anongoth.pl> Changes: head/net/ntopng/Makefile
Change committed. Thanks!