How to include header files using hte link command

Hi, I have a strange problem where I want to include a header file
present in a folder. I will explain it with an example

I have a directory structure
parent --> child --> include --> file test.h
parent folder has a file test.cpp and test.h
in the file test.h i want to link the file test.h present in the child
include directory
I tried to do it by typing link child\include\test.h in the file
test.h present in teh parent directory.
I get an error when i compile this file. Can any one let me know how
to use the link command in the header file? I use Suse linux 10.2 with
glibc version 2.5

sample program
test.cpp
#include "test.h"

void main()
{
#ifdef DISPLAY_DECL
display();
#endif
}

file test.h present in parent directory
link child/include/test.h
file test.h present in child/include/test.h directory

#ifndef DISPLAY_DECL
#define DISPLAY_DECL
#endif
I compile using g++ test.cpp

.

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