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

 Message        This directive will not set the extern_prefix of
                "<name>" because there is a previous declaration of
                the identifer with external linkage at <where>.

 Description    When an identifier is specified in a #pragma
                extern_prefix, the declaration of that identifier
                must appear after the #pragma.

 User Action    Reorder the declaration and the #pragma so that the
                #pragma comes first.