https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63262
--- Comment #20 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> --- (In reply to karsten from comment #19) > I have replaced the resp. library by my MacPorts build and it compiles now! > Perhaps a hacker way, however. Perhaps I install the compiler from MacPorts > after these experiences. And all that only to try openMP on Mac! Maybe try one of the builds on my website: http://coudert.name They are very user-friendly, with graphical installer (they install in /usr/local/gfortran). It says they're gfortran packages, but they also contain the full C and C++ compilers.