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

 Message        <Context> "<name>" is declared with both internal and
                external linkage.  The previous declaration is at
                <location>.

 Description    This warning is output in certain cases when the
                linkage of a declaration conflicts with the linkage
                specified in an earlier declaration.

 User Action    Change one of the declarations so that the linkages
                match.