Sigaction() and Undefined identifier 'siginfo_t'

Is it possible to use the sigaction function in a codewarrior 9 program?  I
am using some sample code from an Apple TechNote, and it gives me the
error:

Undefined identifier 'siginfo_t'

I'm including <signal.h>.  Will this work?  The code compiles with Xcode,
but not codewarrior.

Here is the sample code:

void myHandler(sig, sip, scp)
  int sig;
  siginfo_t *sip;
  struct ucontext *scp;
  {
    hexdouble t;
    ppc_float_state_t *fs;
    ppc_thread_state_t *ss;

    fs = &scp->uc_mcontext->fs;
    ss = &scp->uc_mcontext->ss;

    printf("SIGFPE taken at 0x%x invokes myHandler, fpscr = %08X\n",
            sip->si_addr, fs->fpscr);

      /* Re-arms interrupts when this state is restored */
    fs->fpscr &= FE_ENABLE_ALL_EXCEPT;
      /* Advances the PC when this state is restored */
    ss->srr0 += 4;
    printf("fpscr = %08X\n", fs->fpscr);
}


static struct sigaction act = { myHandler, (sigset_t)0, SA_SIGINFO };

main ()
{

....

        /* Set handler */
    if (sigaction(SIGFPE, &act, (struct sigaction *)0) != 0) {
        perror("Yikes");
        exit(-1);
    }

....

Thanks
B