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

 Message        <Context> the use of the const variable "<name>" in
                place of a literal constant is a language extension.

 Description    Compaq C will allow a non-volatile const variable
                that has been initialized to be used in contexts
                where a constant is required.  For example, as the
                bounds specifier to a file scope array.  This is an
                extension to standard C.  Other C compilers might not
                successfully compile a program that uses this
                extension.

 User Action    Use the constant value instead of the variable.