[Tinyos-help] Include C file in nesC code

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Hi all.
I would like to include some routines in my nesC code as follows
(considering the BlinkApp for example):
/* nesC code*/
implementation
{
     #include "c_code.h"

    event void Boot.booted()
    {
        call Timer0.startPeriodic( 250 );
    }

    event void Timer0.fired()
    {
        Hello(); //Hello() is a function which is inside my C code
    }
}
-------------------------
/*C code*/
/*c_code.h*/

#ifndef C_CODE
#define C_CODE

void Hello();

#endif

---------------
/* c_code.c */

#include "c_code.h"

void Hello()
{
   printf("HELLO!\n")
}
---------------
Compilation terminate with success, but if i try to execute a simulation,
this following error occurs:
undefined symbol: BlinkC$Hello
How can I solve this problem?
Thank you very much for your help!
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