http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51906
--- Comment #42 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-02-03 09:18:36 UTC --- That header isn't even installed, let alone included, on other targets Jack, if you test it please change == to >= in libstdc++-v3/config/os/bsd/darwin/os_defines.h
