http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51779
--- Comment #4 from Tobias Burnus <burnus at gcc dot gnu.org> 2012-01-07 14:08:11 UTC --- I forgot to mention that there exist also unofficial binaries for MacOS at: http://gcc.gnu.org/wiki/GFortranBinaries#MacOS Thus, that could be an alternative to fixing the MPFR issue.