CMCON undefined identifier

/*
* File:   mainfile.c
* Author: Paul
*
* Created on December 17, 2015, 6:37 PM
*/

#include <stdio.h>
#include <stdlib.h>
#include "header.h"

void init(void); // done
void main(void); // partially done
void display(void); // partially done
void beep(void); // done
void bell(void);

unsigned char min, min10; // unsigned character min and min10


void main()
{
    unsigned char sec, min2;
    min = min10 = 0;
    init(); // call the init function
    for(; ;){TMR0 = 0; T0IF=0; display(); // DISPLAY(EXPAIN THIS PLEASE)

    if(!PORTBbits.RB2) // if RA2==0 advance minute count
    {
        min++; // reset/minutes button
        if(min==10) {min=0;}
        TMR0=0; T0IF=0; // clear timer content and interupt flag(WHY?)
        while(!PORTBbits.RB2) //while RA2==0(RA2 is pressed)
        {
            display(); // display as we set?????
            if(T0IF) // if an interrupt has occured
            {
                T0IF=0; // clear the interrupt flag
                min++; // increment minute by 1
                if(min==10){min=0;} // do this
            }
        }
    }

    if(!PORTBbits.RB3) // if RA3 is pressed, advance minutes x10 count
    {
        min10++; // minutes x10 button
        if(min10==10){min10=0;}
        TMR0=0; T0IF=0;
        while(!PORTBbits.RB3)
        {
            display();
            if(T0IF)
            {
                T0IF = 0;
                min10++;
                if(min10==10) {min10=0;}
            }
        }
    }

    if(!PORTBbits.RB4 && (min || min10)) // if RA4(start button is pressed) and min or min10 == 1
    {
        TMR0 = 0; // clear TMR0 content's
        sec = 0;
        min2 = min+1;
        beep(); // beep for a bit
        while(1)
        {
            display(); // display
            if(T0IF)
            {
                T0IF = 0;
                ++sec;
                if(sec==60) {sec=0; --min2;} // minutes count
                if(min2==0) {min2=10; --min10;}
            }
            min = min2 - 1;
            if(!PORTBbits.RB2) // reset/minutes button
            {
                min = min10 = 0;
                while(!PORTBbits.RB2) {display();}
                break;
            }
            if(min==0 && min10==0) {bell(); break;}
        }
    }
  }
}

void init(void)
{
CMCON = 0b11111111;        //comparator off
T0PS0 = 0; T0PS1 = 0; T0PS2 = 1; // timer0 1:32 prescale value
TRISB = 0;             //RB all outputs
TRISA = 0b11111100;
}

void display(void)
{
    unsigned char digit[12];
    digit[0]=0b111111;
    digit[1]=0b110;
    digit[2]=0b1011011;
    digit[3]=0b1001111;
    digit[4]=0b1100110;
    digit[5]=0b1101101;
    digit[6]=0b1111100;
    digit[7]=0b111;
    digit[8]=0b1111111;
    digit[9]=0b1100111;
    digit[10]=0b1110111;        //7 segments for A
    digit[11]=0b111000;                 //7 segments for L

    PORTB=digit[min10];
    LATBbits.LATB0=1; // transistor for cc1 is on(display PORTB[min10] here
    __delay_ms(4);
    LATBbits.LATB0=0; // the transistor for cc1 is off(no more value on cc1)
    PORTB=digit[min]; // display this value
    LATBbits.LATB1=1; // on cc 2
    __delay_ms(4);
    LATBbits.LATB1=0; // then no more value on it
}

void beep(void)
{
  unsigned char i;
  i=0;
  while(i<60)
  {            //duration of beep
   LATBbits.LATB7=1;                //buzzer output 800hz
   _delay(1); // 1 sec delay
   LATBbits.LATB7=0;
   i++;
  }
   LATBbits.LATB7=0;
}

void bell(void)
{
    unsigned char i, j;
    i = 0;
    min = 11; min10=10; // display AL
    while(i<25) // rings
    {
        i++;
        j = 0;
        beep();
        __delay_ms(100);
        beep();
        while(j<25)
        {
            j++;
            display();
        }
        if(!PORTBbits.RB2)
        {
            while(!PORTBbits.RB2) {display();}
            break;
        }
    }
    min = 0; min10=0;
}