--- /dev/null
+diff -Naurp include/avr/sleep.h include/avr/sleep.h
+--- include/avr/sleep.h 2012-02-13 19:05:22.000000000 +0530
++++ include/avr/sleep.h 2012-02-13 19:06:38.000000000 +0530
+@@ -206,7 +206,7 @@
+
+ #define set_sleep_mode(mode) \
+ do { \
+- _SLEEP_CONTROL_REG = ((_SLEEP_CONTROL_REG & ~__BV(SM)) | (mode)); \
++ _SLEEP_CONTROL_REG = ((_SLEEP_CONTROL_REG & ~_BV(SM)) | (mode)); \
+ } while(0)
+
+ #elif defined(__AVR_ATtiny167__) \