Recently someone added this line of workaround to pkgsrc: ENV.append_to_cflags "-fno-stack-check" if DevelopmentTools.clang_build_version >= 1010 (from https://github.com/Homebrew/homebrew-core/blob/master/Formula/guile.rb#L42 ) for guile 2.2.7. I don't know yet if this affects 3, but it seems it would be nice for guile itself to add -fno-stack-check for the combination of mac and newish clang. Has anyone else see this?