/media/sandbox/xtools/avr-dev/build/avr/bin/avr-gcc -g -Wall -O2 -mmcu=at90c8534    -c -o main.o main.c
main.c:12: warning: return type of 'main' is not `int'
main.c: In function `main':
main.c:16: error: `DDRB' undeclared (first use in this function)
main.c:16: error: (Each undeclared identifier is reported only once
main.c:16: error: for each function it appears in.)
main.c:20: error: `PORTB' undeclared (first use in this function)
make: *** [main.o] Error 1