how to fix error C202: 'PINC': undefined identifier

i have this code for gps/gsm based tracking system.
when i start building target it gives this error. help me to fix this error, thank you, my code is this:

//GPS Vehicle tracker
#define F_CPU 12000000 //12Mhz
#include <avr/io.h> //Header file for AVR device specific I/O Definitions.
#include <avr/pgmspace.h> //Header file for incorporating program space string utilities.
#include <util/delay.h> //Header file for incorporating delay routines.
#include<inttypes.h>

#define USART_BAUDRATE 9600
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)

void WaitMs(unsigned int ms);

void usart_init();
unsigned int usart_getch();
void usart_writech(unsigned char data);
void usart_message(unsigned char *var);

unsigned char value,i,lati_value[9],lati_dir, longi_value[10], longi_dir, final_message[30];
unsigned char deg = 0xB0;

int main()
{

DDRC=0x00;
PORTC=0xff;

usart_init();

while(1) { a: value=usart_getch(); if(value=='$') {

value=usart_getch(); if(value=='G') { value=usart_getch(); if(value=='P') { value=usart_getch(); if(value=='G') {

value=usart_getch(); if(value=='A') { value=usart_getch(); if(value==',') { value=usart_getch(); while(value!=',') { value=usart_getch(); }

for(i=0; i<9; i++) {

lati_value[i] = usart_getch();

} value = usart_getch();

lati_dir=usart_getch(); value=usart_getch(); for(i=0; i<10; i++) {

longi_value[i] = usart_getch(); } value = usart_getch();

for(i=1;value!=',';i++) { longi_value[i]=usart_getch();

value=longi_value[i]; } longi_dir=usart_getch(); } } } } } } if(*lati_value && *longi_value) { for(i=0; i<9; i++) { final_message[i] = lati_value[i];

}

final_message[9] = lati_dir; final_message[10] = ' '; for(i=0; i<10; i++) {

final_message[i+11] = longi_value[i]; }

final_message[21] = longi_dir; final_message[22] = '\0'; } else goto a; while(PINC==0xff); WaitMs(1000); usart_message("ATH"); WaitMs(50);

usart_message("AT+CMGF=1"); usart_writech(0x0D); WaitMs(20);

WaitMs(20); usart_message("AT+CMGS=\"+923439335663\""); usart_writech(0x0D); usart_message(final_message);//message usart_writech(0x1A); WaitMs(10000); goto a;

}

return 0;

}

void WaitMs(unsigned int ms)
{ unsigned int i;

for(i=0;i<=ms;i++) { _delay_ms(1); }
}

void usart_init()
{

UCSRB = (1 << RXEN) | (1 << TXEN);

// Use 8-bit character sizes
UCSRC |= (1 << URSEL) | (1 << UCZS0) | (1 << UCZS1);

// Load lower 8-bits of the baud rate value into the low byte of the UBRR register
UBRRL = BAUD_PRESCALE;

UBRRH = (BAUD_PRESCALE >> 8);
}

unsigned int usart_getch()
{

while (!(UCSRA & (1 << RXC)));

return(UDR);
}

void usart_writech(unsigned char data)
{

while(!(UCSRA & (1<<UDRE))); UDR = data;
}

void usart_message(unsigned char *var)
{ int h;
while(*var)
usart_writech(var++); // send message
for(h=0;h<=200;h++);
}

error:
project.c(118): error C202: 'PINC': undefined identifier
Target not created.
Build Time Elapsed: 00:00:00