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

 Message        <Context> the result of the cast "<cast>" is used as
                an lvalue.

 Description    The result of a cast has been used as an lvalue.
                This is a language extension of Compaq C.  The
                program does not conform to the C standard, and might
                not be accepted by other compilers.

 User Action    Remove the cast.