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

 Message        The integer constant is of type "<type>", which is a
                new feature of C99 might not be portable.

 Description    The use of the suffix ULL or LL on an integer
                constant does not conform to the C89 standard and
                might not be accepted by other C compilers.

 User Action    Be aware of this if you wish to port the program.