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

 Message        Integer overflow occurred when computing the size of
                a struct or union type.

 Description    An struct or union type is larger than allowed on
                this platform.  Note that as the compiler computes
                the size of the type in bits, the limit on the size
                of struct/union types is eight times smaller than the
                size of other types.

 User Action    Reduce the size of the struct/union type.