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

 Message        The _Imaginary keyword is not supported by Compaq C.
                It will be treated as an identifier in this
                compilation.

 Description    Support for the _Imaginary keyword is an optional
                extension to the C standard.  Compaq C does not
                support this extension.  All occurrences of
                _Imaginary will be treated as an identifier.

 User Action    Do not use the _Imaginary type.