R1001   Ignoring redefinition of command-line macro

     Explanation:  A make file attempted to assign a new value to a macro
     defined on the command line or in the RMAKE environment variable.  The
     redefinition is ignored, and the macro retains its previous value.

     Action:  Specify an #undef directive to clear the definition of a
     command-line macro, allowing a new value to be assigned.