MACROREDEF

Message        The redefinition of the macro "<name>" conflicts with
               a current definition because <reason>.  The
               redefinition is now in effect.

Description    A macro has been redefined with either different
               formal parameters and/or a different body than a
               previous definition of the macro.

User Action    Either make all definitions of the same macro
               identical, or undefine the macro using the #undef
               preprocessing directive before it is redefined.