Board_config.h will provide the BOARD_BATTERYx_V_DIV

Prep to distrubte the magic numbers assgined in parameters.cpp
  to the board_config.h

  common/board_common.h will define:
  1) BOARD_BATTERY[1|2]_V_DIV as 0.0f if not defined to ensure
      the missing default trips a low voltage lockdown

  2) BOARD_BATTERY[1|2]_A_PER_V as 0.0f if not defined to ensure
     the default leads to an unrealistic current value.

src/modules/sensors/parameters.h

@@ -40,7 +40,7 @@
  *
  * @author Beat Kueng <beat-kueng@gmx.net>
  */
-
+#include <px4_config.h>
 #include <drivers/drv_rc_input.h>
 
 #include <systemlib/param/param.h>