Created attachment 203716 [details] patch Add USES=compiler:c++11-lang to fix build on GCC architectures. Tested on powerpc64 and amd64.
Tested on amd64 also and seems fine.
A commit references this bug: Author: pkubaj Date: Thu Apr 18 14:38:35 UTC 2019 New revision: 499268 URL: https://svnweb.freebsd.org/changeset/ports/499268 Log: devel/elfio: fix build with GCC-based architectures PR: 237312 Approved by: mat (mentor), james.wright@digital-chaos.com (maintainer) Differential Revision: https://reviews.freebsd.org/D19942 Changes: head/devel/elfio/Makefile
Committed, thanks!