if (GL(dl_clktck) != )
if (GL(dl_clktck) != 0)
__profile_frequency (void){#ifdef __ASSUME_AT_CLKTCK  return GL(dl_clktck);#else  if (GL(dl_clktck) != )    return GL(dl_clktck);  struct itimerval tim;  tim.it_interval.tv_sec = 0;  tim.it_interval.tv_usec = 1;  tim.it_value.tv_sec = 0;  tim.it_value.tv_usec = 0;  __setitimer (ITIMER_REAL, &tim, 0);  __setitimer (ITIMER_REAL, 0, &tim);  if (tim.it_interval.tv_usec < 2)    return 0;  return 1000000 / tim.it_interval.tv_usec;#endif}