check_function_exists(_fileno HAVE__FILENO)
check_function_exists(fileno HAVE_FILENO)
check_function_exists(_commit HAVE__COMMIT)
-check_function_exists(lstat HAVE_LSTAT)
check_function_exists(sigaction HAVE_SIGACTION)
check_function_exists(sysconf HAVE_SYSCONF)
check_function_exists(sched_setaffinity HAVE_SCHED_SETAFFINITY)