diff -Naurp gcc/config/avr/avr-devices.c gcc/config/avr/avr-devices.c
--- gcc/config/avr/avr-devices.c 2011-11-08 17:37:12.000000000 +0530
+++ gcc/config/avr/avr-devices.c 2011-11-08 17:38:18.000000000 +0530
-@@ -309,6 +309,7 @@ const struct mcu_type_s avr_mcu_types[]
+@@ -308,6 +308,7 @@ const struct mcu_type_s avr_mcu_types[]
{ "atxmega256c3", ARCH_AVRXMEGA6, "__AVR_ATxmega256C3__", 0, 0x2000, "x256c3" },
{ "atxmega256d3", ARCH_AVRXMEGA6, "__AVR_ATxmega256D3__", 0, 0x2000, "x256d3" },
{ "atxmega384c3", ARCH_AVRXMEGA6, "__AVR_ATxmega384C3__", 0, 0x2000, "x384c3" },
diff -Naurp gcc/config/avr/t-avr gcc/config/avr/t-avr
--- gcc/config/avr/t-avr 2011-11-08 17:37:12.000000000 +0530
+++ gcc/config/avr/t-avr 2011-11-08 17:38:18.000000000 +0530
-@@ -315,6 +315,7 @@ MULTILIB_MATCHES = \
+@@ -314,6 +314,7 @@ MULTILIB_MATCHES = \
mmcu?avrxmega6=mmcu?atxmega256c3 \
mmcu?avrxmega6=mmcu?atxmega256d3 \
mmcu?avrxmega6=mmcu?atxmega384c3 \