[Dev-C++] implicit declaration

[JV <ver...@ya...>]

Hi,

I am writing a small code that can set and unset the
different output pins of the serial port. I have write
a small test code in dev-c++ 4.0 but I get: 

test.cpp:15: implicit declaration of function `int
outport(...)'

However, I have compile it in Borland C++ it works
well. What is the problem.

The test.cpp code:
#include <iostream.h>
#include <conio.h>
#include <dos.h>

#define PORT 0x3F8

#define TXDOFFSET 3

#define TXDHIGH 64
#define TXDLOW  0

int main(){

    outport(PORT+TXDOFFSET,TXDHIGH);
	return 0;
}

Thanks,

Joeri

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