our %args = map { split /\s*=\s*/ } @ARGV;
our $LIBS_LOC = $args{ LIBS } || "-lgmp";
our $INC_LOC = $args{ INC };

##</code><code>##

WriteMakfile(
  ....
  LIBS => $LIBS_LOC,
  INC => $INC_LOC,
  ....
);