The way Drew Speedie recommends is to create a procedure in the bottom of your main.prg. He calls it PROCEDURE PMFAKEOUT. It looks like this.
PROCEDURE PMFAKEOUT
EXTERNAL PROCEDURE BLAH etc.
ENDPROC

This function is never called, but it means you don't get compile errors from the project manager.

>>Why not create a .H file full of EXTERNAL declarations?
>
>I created a file FournierTransformationFunction.h. In that file, I tried with this syntax:
>
>

>#DEFINE IsCookie
>

>
>That didn't work. So, I tried with this:
>
>

>#DEFINE IsCookie()
>

>
>That didn't work. So, I tried with this:
>
>

>FUNCTION IsCookie
>RETURN .F.
>

>
>How should I enter those functions in the header file in order to them to be recognized at compile time?