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#define F_CPU 16000000
 
#include <util/delay.h> 
#include <avr/io.h>
 
int main() { 
 
	DDRC = 0x7F; //All C Ports as OutPut
 
	while (1) { 
 
    PORTC = 0b00000000; //Binary for PC6 PC5 PC4 PC3 PC2 PC1 PC0
    _delay_ms(500);
    PORTC = 0b00000001;
    _delay_ms(500);
 
	} 
}

prog.c:3:25: error: util/delay.h: No such file or directory
prog.c:4:20: error: avr/io.h: No such file or directory
prog.c: In function ‘main’:
prog.c:8: error: ‘DDRC’ undeclared (first use in this function)
prog.c:8: error: (Each undeclared identifier is reported only once
prog.c:8: error: for each function it appears in.)
prog.c:12: error: ‘PORTC’ undeclared (first use in this function)
prog.c:13: warning: implicit declaration of function ‘_delay_ms’

Standard output is empty