>I've created a function called "Myfunction"
>then I kept this function into a file
>named function.prg
>
>then I called it as shown bellow:
>Set procedure to function.prg_myfunction
>aa = myfunction (variable)
>It worked OK
>
>But there's a problem when I use the
>option BUILD.EXE:
>
> File function.prg_myfunction - Undefined
>
>Where is my mistake ?

Just use Set procedure to function.prg