[Dev-C++] ioperm and outb error

[frederico s. <fre...@gm...>]

please see this:

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <asm/io.h>
#include <unistd.h>

#define LPT1 0x378

int libera_porta(){
        if(ioperm(LPT1,3,1)==1)//libera acesso para os endereços
0x378,0x379,0x37A
        return(1);
        else
        return(0);
    }

fecha_porta(){
        ioperm(LPT1,3,0);
    }

main(){
    if(libera_porta() == 1)
        printf("\nPorta liberada com sucesso\n");

    else
        printf("\nPorta nao liberada\n");

    //outb(255,LPT1);

    fecha_porta();

}


I was execute on root, but never get permission to use the lpt, and when
outb is not reviewed I recive this error: (.text+0x101): undefined reference
to '__outb'.
tanks