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

 Message        <Context> the enum "<name>" is not defined.

 Description    The enum tag used to declare an enum variable is not
                defined at this point in the compilation.

 User Action    Define the enum tag before using it.