First attempt at AVR C programming. (Attiny85)

main.c

#include <avr/sleep.h>
#include <avr/interrupt.h>

volatile int pinOutState;

ISR(PCINT0_vect){
 if (pinOutState == 0){
  PORTB = (1 << PB1);
  pinOutState = 1;
 }
 else if (pinOutState == 1){
  PORTB = (0 << PB1);
  pinOutState = 0;
 }
}

int main(void){
 DDRB |= (1 << PB1);
 DDRB &= ~(0 << PB0);
 GIMSK |= (1 << PCIE);
 PCMSK |= (1 << PCINT0);
 MCUCR |= (1 << ISC00) | (1 << ISC01);
 sei();
 sleep_bod_disable();
 sleep_enable();
 while(1){
  sleep_cpu();
 }
}