Amplifier on an Atmega32

I have managed to play a small sound clip stored on an Atmega32. The sound was played through one of the pwm pins and amplified easily using a single mosfet.

I then saw a project here at http://hackaday.com/2012/09/05/70-watt-amp-uses-an-attiny/ that took in audio on an adc pin on an attiny45 and converted it to a pwm signal ready for amplification.

I tried compiling the program for an Atmega32 and I get these errors

main.c:28: error: 'PRR' undeclared (first use in this function)
main.c:28: error: (Each undeclared identifier is reported only once
main.c:28: error: for each function it appears in.)
main.c:34: error: 'TCCR1' undeclared (first use in this function)
main.c:35: error: 'GTCCR' undeclared (first use in this function)
main.c:37: error: 'PLLCSR' undeclared (first use in this function)

make.exe: *** [main.o] Error 1

This is the c program

#include <avr/interrupt.h>
#include <avr/sleep.h>
#include <stdint.h>
#include "avrlibdefs.h"
#include "compat/deprecated.h"

typedef uint32_t u32;
typedef uint16_t u16;
typedef uint8_t u8;
typedef int32_t s32;
typedef int16_t s16;
typedef int8_t s8;

#define DACP OCR1A
#define DACN OCR1B

__attribute__((naked)) int main(void)
{
// Configure ports
DDRB = 0b00010010; // OC0AB are L/R PWM output. Drive unused pins low (helps noise).
PORTB = 0b11100100; // No activate pull-ups

// ADC
ADMUX = 0b11010011; // PB3, AVcc, 10 bit, 2.56VRef
ADCSRA = 0b11000100; // CPU/16 sampling rate; Sampling freq: 16 MHz / 16 / 13 = 78 kHz
// ^ - interrupt enable
// Power reduction
PRR = 0b00000110; // Clock-gate USI and Counter0.
MCUCR = 0b00100000;


// PWM
//OCR1C = 255;
TCCR1 = 0b01100010; // non-inv PWM, 32MHz / 512 = 62 kHz
GTCCR = 0b01100000;
TIMSK = 0b100;
PLLCSR = 0b110;

sei();

while(1) {
sleep_cpu();
}
}


// 50% duty cycle at idle. Slightly less efficient, but better sounding.
u8 time;
u16 pos;
u16 neg;

ISR(TIMER1_OVF_vect) {

if(1 & ++time) {
u16 adc = ADC;
s16 val1 = (adc >> 1) - 256;
u8 val2 = (u8)(adc & 1);

pos = 256 + val1 + val2;
neg = 256 - val1;

if(val1 >= 254)
pos = 510;

if(val1 <= -255)
neg = 510;

if(pos > 255) {
DACP = 255;
pos -= 255;
} else {
DACP = pos;
pos = 0;
}

if(neg > 255) {
DACN = 255;
neg -= 255;
} else {
DACN = neg;
neg = 0;
}

} else {
DACP = pos;
DACN = neg;
}
}



Is there something I need to change?