AVR-Chat

I am trying out some GCC code.  I started with the BDmicro example 
which sets a timer interrupt and flashes the LED on his board.  I 
then tried to make the interrupt handler toggle the LED avery 1024 
ticks.  I got errors that I can't explain.

Here is the code.  WHite space is slightly trimmed for compactness


--------------------------------------
#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/signal.h>
#include <inttypes.h>

volatile uint16_t ms_count;
 /* millisecond counter interrupt vector */
 
SIGNAL(SIG_OUTPUT_COMPARE0)
{
  ms_count++;
  If (ms_count == 1024) 
  {
	PORTB ^= 0x01;    /* toggle LED */ /* toggles every second */
	ms_count = 0;
  }
}

void init_timer(void)
{
  /*
   * Initialize timer0 to generate an output compare interrupt, and
   * set the output compare register so that we get that interrupt
   * every millisecond.
   */
  TIFR  |= _BV(OCIE0);
  TCCR0  = _BV(WGM01)|_BV(CS02)|_BV(CS00); /* CTC, prescale = 128 */
  TCNT0  = 0;
  TIMSK |= _BV(OCIE0);    /* enable output compare interrupt */
  OCR0   = 125;          /* match in 1 ms */
}


int main(void)
{
	DDRB = 0x01;  /* enable PORTB 1 as an output */
	init_timer();

  /* enable interrupts */
	sei();
	while (1) 
        {
    /* loop endlessly */
	}

}


----------- and the error I get is:

> "make.exe" all
avr-gcc -g -mmcu=atmega128 -Wall -O   -c -o hw.o hw.c
hw.c: In function `__vector_15':
hw.c:50: warning: implicit declaration of function `If'
hw.c:51: error: parse error before '{' token
hw.c: At top level:
hw.c:55: error: parse error before '}' token
make.exe: *** [hw.o] Error 1

> Process Exit Code: 2


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The IF statement inside the interrupt handler is the problem.

It looks fine to me.  What is wrong?

-Tony