http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54725
--- Comment #8 from Mike Frysinger <vapier at gentoo dot org> 2012-10-20 16:55:05 UTC --- (In reply to comment #7) that patch doesn't work as there is a typo in Make-lang.in. it needs to be: CFLAGS-fortran/cpp.o += $(TARGET_SYSTEM_ROOT_DEFINE) then it works OK