If the compiler does not support C99, you can define bool type yourself.

stdbool.h

#include <stdbool.h> 
– Keith Thompson

If the compiler does not support C99, you can define bool type yourself:

// file : myboolean.h
#ifndef MYBOOLEAN_H
#define MYBOOLEAN_H

#define false 0
#define true 1
typedef int bool; // or #define bool int

#endif

http://stackoverflow.com/questions/8133074/error-unknown-type-name-bool