--- /dev/null
+diff -Naurp include/avr/iom16hvb.h include/avr/iom16hvb.h
+--- include/avr/iom16hvb.h 2011-12-29 14:21:49.000000000 +0530
++++ include/avr/iom16hvb.h 2012-08-13 15:23:58.000000000 +0530
+@@ -970,10 +970,10 @@
+ #define VREF_PIN PINVREF
+ #define VREF_BIT VREF
+
+-#define VREF_DDR DDRVREFGND
+-#define VREF_PORT PORTVREFGND
+-#define VREF_PIN PINVREFGND
+-#define VREF_BIT VREFGND
++#define VREFGND_DDR DDRVREFGND
++#define VREFGND_PORT PORTVREFGND
++#define VREFGND_PIN PINVREFGND
++#define VREFGND_BIT VREFGND
+
+ #define PI_DDR DDRI
+ #define PI_PORT PORTI
+diff -Naurp include/avr/iom32hvb.h include/avr/iom32hvb.h
+--- include/avr/iom32hvb.h 2011-12-29 14:21:49.000000000 +0530
++++ include/avr/iom32hvb.h 2012-08-13 15:26:48.000000000 +0530
+@@ -970,10 +970,10 @@
+ #define VREF_PIN PINVREF
+ #define VREF_BIT VREF
+
+-#define VREF_DDR DDRVREFGND
+-#define VREF_PORT PORTVREFGND
+-#define VREF_PIN PINVREFGND
+-#define VREF_BIT VREFGND
++#define VREFGND_DDR DDRVREFGND
++#define VREFGND_PORT PORTVREFGND
++#define VREFGND_PIN PINVREFGND
++#define VREFGND_BIT VREFGND
+
+ #define PI_DDR DDRI
+ #define PI_PORT PORTI