When using a --mem=<dir> the memdir must be removed to assure

      mtr_verbose("Removing $opt_vardir/");

      rmtree("$opt_vardir/");

    }

    if ( $opt_mem )

    {

      # A symlink from var/ to $opt_mem will be set up

      # remove the $opt_mem dir to assure the symlink

      # won't point at an old directory

      mtr_verbose("Removing $opt_mem");

      rmtree($opt_mem);

    }

  }

  else

  {