/sys$common/syshlp/helplib.hlb CC, Messages, STRUCTLIMITSUP  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        <Context> Compaq C provides only limited support for
                struct/union types larger than <n> bytes.

 Description    This struct/union type is larger than can be
                represented by size_t.  While Compaq C will allow a
                type declared to be this size, uses of the type are
                not fully supported and may cause unpredictable
                behavior.

 User Action    Reduce the size of the type.