Ok mach ich!
Hier:

avr-gcc --version
avr-gcc (GCC) 3.3.1
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

avr-gcc -c -mmcu=atmega8 -I. -g -Os -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Wall -Wstrict-prototypes -Wa,-ahlms=test.lst test.c -o test.o
test.c: In function `main':
test.c:7: error: parse error before "while"
make: *** [test.o] Error 1

> Process Exit Code: 2

P.S.: Danke für die Schnelle Antwort!