[fpc-pascal] How to call lib routines with cdecl calling convention with win32 app?

[Coco Pascal]

I have a library with udf routines using the cdecl calling convention, 
required by Firebird. This seems to work well on win32.
However when I test these routines with a fpc win32 app declaring 
external functions with the cdecl or stdcall calling convention gives me 
a 'entrypoint not found' error. I assume cdecl is obligatory, but can I 
implement that?