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

 Message        <Context> the struct or union member "<name>" cannot
                be declared with a variably modified type.

 Description    Only ordinary identifiers with block scope and
                without storage class extern, or ordinary identifiers
                with function prototype scope can be declared with a
                variably modified type.

 User Action    Correct the declaration.