VMS Help CC, Messages, PARMINCOMP  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        <Context> the parameter <name> has an incomplete
                type.

 Description    The parameter of an old-style function definition has
                an incomplete type.  This is not valid.

 User Action    Complete the type before the declaration of the
                parameter.  Compaq also recommends that old-style
                function definitions be replaced by prototype-format
                definitions.