llround(), round() broken?

[Alan Corey]

They probably aren't broken, looks like I need to link in some library.  I 
get "undefined reference to" when I try to compile/link.  Shouldn't this 
be mentioned in the man page?

  Alan
/*
   test of llround() & round(), fails under 4.7 and 5.0
*/

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <sys/types.h>

int main(void) {
  int64_t big;
  int anint;

  big = llround(3/2);
  anint = round(3/2);

  return 0;
}