get_tracking_state()

[fallen751]

I have a question about how to use get_tracking_state(). I have included the tracking.h header file in my code, and I call the function in a normal if statement like this: if (get_tracking_state() == CAMERA_ON_TARGET)
{
our code;
}
anyways no where in user_routines_fast.c have I defined get_tracking_state(), and the only reason it compiles most of he way is because its prototyped in tracking.h. So my question is how I do I define it, or is there a global variable I can use that will suit my need.

The error I get at the end of the compile looks like this;
MPLINK 3.90, Linker
Copyright (c) 2004 Microchip Technology Inc.
Error - could not find definition of symbol 'get_tracking_state' in file 'C:\Feb 3rd\frc_camera_21\user_routines_fast.o'.
Errors : 1

thanks for any help!!!