In ./board/sunxi/board.c, changed CONFIG_MACPWR to:

#ifdef CONFIG_MACPWR
  printf("Enter macpwr: \n");
	macpwr_pin = sunxi_name_to_gpio(CONFIG_MACPWR);
	ret = gpio_request(macpwr_pin, "macpwr");
  if (ret) {
		printf("Error setting macpwr pin: '%s', err %d\n",
		       CONFIG_MACPWR, ret);
	} else {
    gpio_direction_output(macpwr_pin, 1);
  }
#endif

Results:

Enter macpwr:
Error setting macpwr pin: 'PD6', err -2