Created attachment 197010 [details] Update llvm dependency llvm60 is increasingly the default version. The attached patch switching the version of clang used on 10.x systems to clang60. This works for me in poudriere on 10.4 amd64.
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A commit references this bug: Author: brooks Date: Tue Sep 25 22:05:46 UTC 2018 New revision: 480700 URL: https://svnweb.freebsd.org/changeset/ports/480700 Log: Update 10.x build depend on clang to llvm60. PR: 231288 Approved by: maintainer timeout (15 days) Sponsored by: DARPA, AFRL Changes: head/cad/sumo/Makefile