bkw@venus:~/tmp/code$ cat Makefile
MCU=atmega16
F_CPU=4000000
F_OSC=4000000
CC=avr-gcc
OBJCOPY=avr-objcopy
# optimize for size:
CFLAGS=-g -mmcu=$(MCU) -Wall -Wstrict-prototypes -Os -mcall-prologues
all: test.hex
test.hex : test.out
        $(OBJCOPY) -R .eeprom -O ihex test.out test.hex
test.out : test.o
        $(CC) $(CFLAGS) -o test.out -Wl,-Map,test.map test.o
test.o : test.c
        $(CC) $(CFLAGS) -Os -c test.c
#erase the AVR before it is programmed
load: test.hex
clean:
        rm -f *.o *.map *.out