diff -Naurp include/avr/wdt.h include/avr/wdt.h
--- include/avr/wdt.h	2013-03-15 12:07:15.000000000 +0530
+++ include/avr/wdt.h	2013-03-15 12:25:20.000000000 +0530
@@ -107,8 +107,10 @@
 
 #if defined(WDTCSR)
 #  define _WD_CONTROL_REG     WDTCSR
-#else
+#elif defined(WDTCR)
 #  define _WD_CONTROL_REG     WDTCR
+#else
+#  define _WD_CONTROL_REG     WDT
 #endif
 
 #if defined(WDTOE)
@@ -359,6 +361,137 @@ __asm__ __volatile__ (  \
 )
 
 
+#elif defined(__AVR_ATtiny1634__) \
+|| defined(__AVR_ATtiny828__)
+
+#define wdt_enable(value) \
+__asm__ __volatile__ ( \
+    "in __tmp_reg__,__SREG__" "\n\t"  \
+    "cli" "\n\t"  \
+    "wdr" "\n\t"  \
+    "sts %[CCPADDRESS],%[SIGNATURE]" "\n\t"  \
+    "sts %[WDTREG],%[WDVALUE]" "\n\t"  \
+    "out __SREG__,__tmp_reg__" "\n\t"  \
+    : /* no outputs */  \
+    : [CCPADDRESS] "M" (_SFR_MEM_ADDR(CCP)),  \
+      [SIGNATURE] "r" ((uint8_t)0xD8), \
+      [WDTREG] "M" (_SFR_MEM_ADDR(_WD_CONTROL_REG)), \
+      [WDVALUE] "r" ((uint8_t)((value & 0x08 ? _WD_PS3_MASK : 0x00) \
+      | _BV(WDE) | value)) \
+    : "r0" \
+)
+
+#define wdt_disable() \
+do { \
+uint8_t temp_wd; \
+__asm__ __volatile__ ( \
+    "in __tmp_reg__,__SREG__" "\n\t"  \
+    "cli" "\n\t"  \
+    "wdr" "\n\t"  \
+    "out %[CCPADDRESS],%[SIGNATURE]" "\n\t"  \
+    "in  %[TEMP_WD],%[WDTREG]" "\n\t" \
+    "cbr %[TEMP_WD],%[WDVALUE]" "\n\t" \
+    "out %[WDTREG],%[TEMP_WD]" "\n\t" \
+    "out __SREG__,__tmp_reg__" "\n\t" \
+    : /*no output */ \
+    : [CCPADDRESS] "I" (_SFR_IO_ADDR(CCP)), \
+      [SIGNATURE] "r" ((uint8_t)0xD8), \
+      [WDTREG] "I" (_SFR_IO_ADDR(_WD_CONTROL_REG)), \
+      [TEMP_WD] "d" (temp_wd), \
+      [WDVALUE] "I" (1 << WDE) \
+    : "r0" \
+); \
+}while(0)
+
+#elif defined(__AVR_ATtiny4__) \
+|| defined(__AVR_ATtiny5__) \
+|| defined(__AVR_ATtiny9__) \
+|| defined(__AVR_ATtiny10__) \
+|| defined(__AVR_ATtiny20__) \
+|| defined(__AVR_ATtiny40__) 
+
+#define wdt_enable(value) \
+__asm__ __volatile__ ( \
+    "in __tmp_reg__,__SREG__" "\n\t"  \
+    "cli" "\n\t"  \
+    "wdr" "\n\t"  \
+    "out %[CCPADDRESS],%[SIGNATURE]" "\n\t"  \
+    "out %[WDTREG],%[WDVALUE]" "\n\t"  \
+    "out __SREG__,__tmp_reg__" "\n\t"  \
+    : /* no outputs */  \
+    : [CCPADDRESS] "I" (_SFR_IO_ADDR(CCP)),  \
+      [SIGNATURE] "r" ((uint8_t)0xD8), \
+      [WDTREG] "I" (_SFR_IO_ADDR(_WD_CONTROL_REG)), \
+      [WDVALUE] "r" ((uint8_t)((value & 0x08 ? _WD_PS3_MASK : 0x00) \
+      | _BV(WDE) | value)) \
+    : "r16" \
+)
+
+#define wdt_disable() \
+do { \
+uint8_t temp_wd; \
+__asm__ __volatile__ ( \
+    "in __tmp_reg__,__SREG__" "\n\t"  \
+    "cli" "\n\t"  \
+    "wdr" "\n\t"  \
+    "out %[CCPADDRESS],%[SIGNATURE]" "\n\t"  \
+    "in  %[TEMP_WD],%[WDTREG]" "\n\t" \
+    "cbr %[TEMP_WD],%[WDVALUE]" "\n\t" \
+    "out %[WDTREG],%[TEMP_WD]" "\n\t" \
+    "out __SREG__,__tmp_reg__" "\n\t" \
+    : /*no output */ \
+    : [CCPADDRESS] "I" (_SFR_IO_ADDR(CCP)), \
+      [SIGNATURE] "r" ((uint8_t)0xD8), \
+      [WDTREG] "I" (_SFR_IO_ADDR(_WD_CONTROL_REG)), \
+      [TEMP_WD] "d" (temp_wd), \
+      [WDVALUE] "I" (1 << WDE) \
+    : "r16" \
+); \
+}while(0)
+
+#elif defined(__AVR_ATxmega32X1__) \
+||defined(__AVR_ATxmega64A1__)
+
+#define wdt_enable(value) \
+__asm__ __volatile__ ( \
+    "in __tmp_reg__,__SREG__" "\n\t"  \
+    "cli" "\n\t"  \
+    "wdr" "\n\t"  \
+    "sts %[CCPADDRESS],%[SIGNATURE]" "\n\t"  \
+    "sts %[WDTREG],%[WDVALUE]" "\n\t"  \
+    "out __SREG__,__tmp_reg__" "\n\t"  \
+    : /* no outputs */  \
+    : [CCPADDRESS] "M" (_SFR_MEM_ADDR(CCP)),  \
+      [SIGNATURE] "r" ((uint8_t)0xD8), \
+      [WDTREG] "M" (_SFR_MEM_ADDR(_WD_CONTROL_REG)), \
+      [WDVALUE] "r" ((uint8_t)((_BV(WDT_ENABLE_bp)) | (_BV(WDT_CEN_bp)) | \
+                                   (value << WDT_PER_gp))) \
+    : "r0" \
+)
+
+#define wdt_disable() \
+__asm__ __volatile__ ( \
+    "in __tmp_reg__,__SREG__" "\n\t"  \
+    "cli" "\n\t"  \
+    "wdr" "\n\t"  \
+    "sts %[CCPADDRESS],%[SIGNATURE]" "\n\t"  \
+    "sts %[WDTREG],%[WDVALUE]" "\n\t"  \
+    "out __SREG__,__tmp_reg__" "\n\t"  \
+    : /* no outputs */  \
+    : [CCPADDRESS] "M" (_SFR_MEM_ADDR(CCP)),  \
+      [SIGNATURE] "r" ((uint8_t)0xD8), \
+      [WDTREG] "M" (_SFR_MEM_ADDR(_WD_CONTROL_REG)), \
+      [WDVALUE] "r" ((uint8_t)((_BV(WDT_CEN_bp)))) \
+    : "r0" \
+) 
+
+/**
+Undefining explicitly so that it produces an error.
+ */
+#elif defined(__AVR_AT90C8534__) \
+|| defined(__AVR_M3000__) 
+    #undef wdt_enable
+    #undef wdt_disale    
     
 #else