how to compile d programm with external c function

[meldolion]

I tried to use this official page to solve a problem :
http://www.digitalmars.com/d/2.0/interfaceToC.html

The problem is there is nothing said about compiling this source.

I created a main.d and a helloworld.c sourcefile. 

module main;
import std.string;

extern (C)
{
void printHelloWorld();
}

void main(){
printHelloWorld();
}





helloworld.c

#include <stdio.h>

void printHelloWorld(){
printf("hello world");
}


I created the object file for helloworld.c.

but when i call

bud_win_3.04.exe main.d helloworld.o 

i get following error message.

OPTLINK (R) for Win32 Release 8.00.1
Copyright (C) Digital Mars 1989-2004 All rights reserved.
main.obj(main) 
Error 42: Symbol Undefined _printHelloWorld

Does anyone knows the solution of this problem?

thx meldolion