http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54847
--- Comment #14 from Jeremy Huddleston Sequoia <jeremyhu at macports dot org> 2012-10-07 22:49:50 UTC --- Your patch looks wrong to me. You should just get rid of the '#if _POSIX_TIMERS > 0' check and always use 'struct timespec' : http://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_nanosleep.html If there are some platforms which don't conform and need 'timespec' instead of 'struct timespec', then you can certainly work around those on a case by case basis, but the _POSIX_TIMERS conditional has no reason to be there as far as I can tell... You should also do something similar for the clock_gettime and sched_yield checks.