How to read temperature from pic16f628 and css c compiler

//************************************************************
// Function:  Temperature logger: UART at 9600 baud
// Processor: PIC16F628 at 4 MHz using internal RC oscillator
// Hardware:  K4
// Software:  CCS PCM
// Author:	  Cheruiyot Felix, felix@nairobicoder.com	
// Credit:    Lars Petersen, oz1bxm@pobox.com
//************************************************************

#include <16F628.h>
#fuses INTRC_IO, NOLVP, NOWDT, PUT, BROWNOUT
#device ADC=8;
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=pin_B2, rcv=pin_B1)

void main() {
//Initialize values
unsigned int val;
int t;
setup_adc_ports(AN0);
setup_adc(ADC_CLOCK_INTERNAL);
set_adc_channel(0);
   while(read_adc()) {
	val=read_adc();
	t=round(val*0.48876);                   //as per http://www.best-microcontroller-projects.com/temperature-recorder.html tutorial
	delay_ms(500);
	printf("T%d",t);				//Output temperature
   }
}

Clean: Deleting intermediary and output files.
Clean: Deleted file "final.ESYM".
Clean Warning: File "C:\Program Files\PICC\final.o" doesn't exist.
Clean: Deleted file "final.ERR".
Clean: Done.
Executing: "C:\Program files\Picc\CCSC.exe" +FM "final.c" +DF +LN +T +A +M +Z +Y=9 +EA
*** Error 12 "final.c" Line 21(10,11): Undefined identifier  -- setup_adc
*** Error 12 "final.c" Line 22(16,17): Undefined identifier  -- setup_adc_ports
*** Error 12 "final.c" Line 23(16,17): Undefined identifier  -- set_adc_channel
*** Error 12 "final.c" Line 26(8,9): Undefined identifier  -- round
      4 Errors,  0 Warnings.
Build Failed.
Halting build on first failure as requested.
BUILD FAILED: Thu Apr 26 00:11:19 2012

void main(){
    init();  //disable interrupts, select analog input in, set tri-status, ans so on
    while (1){
       delay1ms();
       convert(temperature);  //convert the temperature at a certain interval
    }
}