On Mon, Jan 5, 2009 at 8:48 AM, Mauro de Wit <maurodewit@xxxxxxxxx> wrote: > If I copy the method signature from the Deskbar source (interfacePrivate.h) > to my own header file, doesn't the compiler expect me to implement those > methods in my cpp file? My developer platform is R5, but this should't > matter right? That might actually matter since there's no guarantee that Haiku's private calls have the same signature as those of R5. As Stefano already said, the compiler doesn't care about the implementation until the linker stage, at which point it will try to match it in every available library that's being included in the link, ergo if it exists in libbe, it will be found at that stage. Some specifics as to what error you're seeing exactly would help ascertain exactly what the problem is though. Regards, Rene