https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65306
--- Comment #11 from howarth at bromo dot med.uc.edu --- I see no problems here on darwin13.4.0 (with mpc-1.0.2, gmp-6.0.0a, mpfr-3.1.2, isl-0.12.2 and cloog-0.18.2 present in the gcc-4_9-branch svn tree as mpc, gmp, mpfr, isl and cloog) using... cd work ../gcc-4.9.3-20150227/configure --prefix=/Users/howarth/dist --enable-languages=c,c++ --with-system-zlib --x-includes=/usr/X11R6/include --x-libraries=/usr/X11R6/lib --enable-threads --enable-static make -j8 bootstrap The in-tree bootstrap completes without errors.