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

 Message        Hexadecimal floating point constants are not
                supported on this platform.

 Description    Hexadecimal floating point constants are a new
                feature in C99 that is not being implemented on the
                VAX platform.

 User Action    Please use traditional syntax for floating point
                numbers.