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

 Message        In the definition of the function "<function name>",
                the parameter "<parameter name>" has an incomplete
                type.

 Description    This function definition contains a parameter with an
                incomplete type other than an array whose bounds are
                not specified.  This is not valid.

 User Action    Complete the type before the function definition.