Created attachment 189785 [details] Add C++98 to the CFLAGS. CalculiX has issues with modern C++ standards so just set C++98 for now. The issue has been reported upstream so hopefully we won't depend on this forever.
A commit references this bug: Author: riggs Date: Sat Feb 17 17:33:55 UTC 2018 New revision: 462174 URL: https://svnweb.freebsd.org/changeset/ports/462174 Log: Fix build with clang 6.0.0 PR: 225209 Submitted by: pfg (maintainer) Changes: head/cad/calculix/Makefile
Committed with a PORTREVISION bump, since the resulting binary probably changes due to the std= flag.