avr-gcc -c -g -Os -Wall -Wstrict-prototypes -I/media/sandbox/xtools/avr-dev/build/avr/lib/avrlib -Wa,-ahlms=main.lst -mmcu=attiny28  -I/media/sandbox/xtools/avr-dev/build/avr/include -I/media/sandbox/xtools/avr-dev/build/avr/avr/include -I. main.c -o main.o
main.c:0: error: MCU `attiny28' supported for assembler only
In file included from /media/sandbox/xtools/avr-dev/build/avr/lib/gcc/avr/3.4.4/../../../../avr/include/avr/io.h:295,
                 from main.c:18:
/media/sandbox/xtools/avr-dev/build/avr/lib/gcc/avr/3.4.4/../../../../avr/include/avr/iotn28.h:51:4: warning: #warning "MCU not supported by the C compiler"
main.c: In function `main':
main.c:93: error: `DDRA' undeclared (first use in this function)
main.c:93: error: (Each undeclared identifier is reported only once
main.c:93: error: for each function it appears in.)
main.c:96: error: `DDRB' undeclared (first use in this function)
main.c:97: error: `PORTB' undeclared (first use in this function)
main.c:103: error: `DDRC' undeclared (first use in this function)
main.c:106: error: `PORTC' undeclared (first use in this function)
make: *** [main.o] Error 1