diff --git a/libraries/ds1302/examples/set_clock/set_clock.pde b/libraries/ds1302/examples/set_clock/set_clock.ino
similarity index 100%
rename from libraries/ds1302/examples/set_clock/set_clock.pde
rename to libraries/ds1302/examples/set_clock/set_clock.ino
diff --git a/wordclock/Arduino.mk b/wordclock/Arduino.mk
index 7667d00..e61067e 100644
--- a/wordclock/Arduino.mk
+++ b/wordclock/Arduino.mk
@@ -58,7 +58,7 @@
 #
 #    ARDUINO_DIR  - Where the Arduino software has been unpacked
 #    TARGET       - The basename used for the final files. Canonically
-#                   this would match the .pde file, but it's not needed
+#                   this would match the .ino file, but it's not needed
 #                   here: you could always set it to xx if you wanted!
 #    ARDUINO_LIBS - A list of any libraries used by the sketch (we assume
 #                   these are in $(ARDUINO_DIR)/hardware/libraries
@@ -72,7 +72,7 @@
 #
 # All of the object files are created in the build-cli subdirectory
 # All sources should be in the current directory and can include:
-#  - at most one .pde file which will be treated as C++ after the standard
+#  - at most one .ino file which will be treated as C++ after the standard
 #    Arduino header and footer have been affixed.
 #  - any number of .c, .cpp, .s and .h files
 #
@@ -139,6 +139,7 @@ endif
 
 ARDUINO_LIB_PATH  = $(ARDUINO_DIR)/libraries
 ARDUINO_CORE_PATH = $(ARDUINO_DIR)/hardware/arduino/cores/arduino
+ARDUINO_VARIANT_PATH = $(ARDUINO_DIR)/hardware/arduino/variants/$(ARDUINO_VARIANT)
 
 endif
 
@@ -151,10 +152,10 @@ OBJDIR  	  = build-cli
 LOCAL_C_SRCS    = $(wildcard *.c)
 LOCAL_CPP_SRCS  = $(wildcard *.cpp)
 LOCAL_CC_SRCS   = $(wildcard *.cc)
-LOCAL_PDE_SRCS  = $(wildcard *.pde)
+LOCAL_INO_SRCS  = $(wildcard *.ino)
 LOCAL_AS_SRCS   = $(wildcard *.S)
 LOCAL_OBJ_FILES = $(LOCAL_C_SRCS:.c=.o) $(LOCAL_CPP_SRCS:.cpp=.o) \
-		$(LOCAL_CC_SRCS:.cc=.o) $(LOCAL_PDE_SRCS:.pde=.o) \
+		$(LOCAL_CC_SRCS:.cc=.o) $(LOCAL_INO_SRCS:.ino=.o) \
 		$(LOCAL_AS_SRCS:.S=.o)
 LOCAL_OBJS      = $(patsubst %,$(OBJDIR)/%,$(LOCAL_OBJ_FILES))
 
@@ -209,6 +210,7 @@ LIB_OBJS      = $(patsubst $(ARDUINO_LIB_PATH)/%.cpp,$(OBJDIR)/libs/%.o,$(LIB_SR
 
 CPPFLAGS      = -mmcu=$(MCU) -DF_CPU=$(F_CPU) \
 			-I. -I$(ARDUINO_CORE_PATH) \
+			-I$(ARDUINO_VARIANT_PATH) \
 			$(SYS_INCLUDES) -g -Os -w -Wall \
 			-ffunction-sections -fdata-sections
 CFLAGS        = -std=gnu99
@@ -217,7 +219,7 @@ ASFLAGS       = -mmcu=$(MCU) -I. -x assembler-with-cpp
 LDFLAGS       = -mmcu=$(MCU) -lm -Wl,--gc-sections -Os
 
 # Rules for making a CPP file from the main sketch (.cpe)
-PDEHEADER     = \\\#include \"WProgram.h\"
+INOHEADER     = \\\#include \"Arduino.h\"
 
 # Expand and pick the first port
 ARD_PORT      = $(firstword $(wildcard $(ARDUINO_PORT)))
@@ -268,9 +270,9 @@ $(OBJDIR)/%.d: %.S
 $(OBJDIR)/%.d: %.s
 	$(CC) -MM $(CPPFLAGS) $(ASFLAGS) $< -MF $@ -MT $(@:.d=.o)
 
-# the pde -> cpp -> o file
-$(OBJDIR)/%.cpp: %.pde
-	$(ECHO) $(PDEHEADER) > $@
+# the ino -> cpp -> o file
+$(OBJDIR)/%.cpp: %.ino
+	$(ECHO) $(INOHEADER) > $@
 	$(CAT)  $< >> $@
 
 $(OBJDIR)/%.o: $(OBJDIR)/%.cpp
diff --git a/wordclock/Makefile b/wordclock/Makefile
index ed13c59..f22f95c 100644
--- a/wordclock/Makefile
+++ b/wordclock/Makefile
@@ -8,6 +8,9 @@ SMCU         = m328p
 F_CPU        = 16000000
 ARDUINO_PORT = /dev/ttyUSB*
 
+#ARDUINO_VARIANT = mega
+ARDUINO_VARIANT = standard
+
 AVRDUDE_ARD_PROGRAMMER = arduino
 AVRDUDE_ARD_BAUDRATE   = 57600
 #AVRDUDE_ARD_EXTRAOPTS  = -F
diff --git a/wordclock/wordclock.pde b/wordclock/wordclock.ino
similarity index 100%
rename from wordclock/wordclock.pde
rename to wordclock/wordclock.ino