I’d open a ticket, since whatever variant causes code to build with -R is at fault. -R means nothing to clang (hence extraneous flags error). On Mar 22, 2014, at 20:07, terry at digital-outpost.com wrote: > :info:build clang: error: unknown argument: '-R/opt/local/lib' [-Wunused-command-line-argument-hard-error-in-future]