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

 Message        The member "<name>" has an incomplete type.

 Description    A struct or union member must not have an incomplete
                type.  An exception is that Compaq C will accept a
                member that is an array with unspecified bounds,
                although warnings are often generated for this case.

 User Action    Complete the type before it is used in as a member of
                a struct or union.