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

 Message        The static declaration of "<name>" is a tentative
                definition and specifies an incomplete type.

 Description    This file scope static declaration declares an
                identifier with incomplete type.  This is not valid
                because a static declaration will allocate storage
                for the object, but the object's size is not known at
                this point in the compilation.

 User Action    Complete the type before the static declaration.