Created attachment 198776 [details] patch USES=compiler:c++11-lang is required to build on GCC architectures. While here, add USES=gnome mate. Tested on powerpc64 and amd64. Hardware sponsored by IntegriCloud.
Do you have the build log? It looks odd for a C project to require C++11.
(In reply to Ting-Wei Lan from comment #1) It turns out that our stanza for "c++11-lang" and "c11" do exactly the same thing. We have generally been testing against the former. However, I can re-test against the latter.
A commit references this bug: Author: linimon Date: Sat Nov 24 09:11:01 UTC 2018 New revision: 485738 URL: https://svnweb.freebsd.org/changeset/ports/485738 Log: Add compiler:c11 to USES to fix build on gcc-based archs. PR: 232817 Submitted by: Piotr Kubaj Reviewed by: Ting-Wei Lan Changes: head/graphics/eom/Makefile
A commit references this bug: Author: linimon Date: Tue Nov 27 16:32:44 UTC 2018 New revision: 486023 URL: https://svnweb.freebsd.org/changeset/ports/486023 Log: Previous patch did not include adding gmake mate to USES. PR: 232817 Reported by: Piotr Kubaj Approved by: portmgr (tier-2 blanket) Changes: head/graphics/eom/Makefile