extern int _dl_clktck;	  return _dl_clktck ?: SYSTEM_CLK_TCK;
return GL(dl_clktck) ?: SYSTEM_CLK_TCK;
__getclktck (){  extern int _dl_clktck;	/* Defined in dl-load.c.  */  return _dl_clktck ?: SYSTEM_CLK_TCK;}