https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71767
--- Comment #11 from Jeremy Huddleston Sequoia <jeremyhu at macports dot org> --- (In reply to Jeffrey Walton from comment #5) > # port install clang-3.8 > # port install gcc6 > # ln -s /opt/local/bin/clang /opt/local/bin/clang-3.8 You probably meant: $ ln -s clang-mp-3.8 /opt/local/bin/clang However, don't create the symlink yourself. Use 'sudo port select clang mp-clang-3.8'