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

 Message        <Context> the type of "<name>" is not compatible with
                the type of a previous declaration of "<name>" at
                <location>.

 Description    The same identifier has been redeclared with a type
                that is incompatible with the type given in a
                previous visible declaration.  In some modes, the
                compiler will use the redeclared type as the type of
                the identifier.

 User Action    Change the declarations to use compatible types.