Simulate the Boolean type in C

What is the most appropriate way to simulate type bool in C? My teacher did it quite simply.

#define bool int

But I also found an excellent answer aqui ( follows a copy of the code).

// Criando a enumeração:
enum boolean {
    true = 1, false = 0
};
// Permitindo a sua declaração como um tipo qualquer:
typedef  enum boolean  bool;

// Agora podemos escrever e compilar os códigos como:
int main () {

    bool b = true;
    if (b) {
        b = false;
    }

    return 0;
}

What are the pros and cons of both types of claims and where can they cause me a headache in the future if I implement them in a library?