IAR include problem

Hi,
kann mir bitte jemand sagen was ich falsch mache? mein compiler meckert
die ganze zeit..

>Compiler output:
Making target Debug...
demo.c
C:\Programme\IAR Systems\Ew23\avr\tutor\demo.c (21) :
Error[Pe020]: identifier "RXEN" is undefined
C:\Programme\IAR Systems\Ew23\avr\tutor\demo.c (21) :
Error[Pe020]: identifier "TXEN" is undefined
C:\Programme\IAR Systems\Ew23\avr\tutor\demo.c (22) :
Error[Pe020]: identifier "USREL" is undefined
C:\Programme\IAR Systems\Ew23\avr\tutor\demo.c (22) :
Error[Pe020]: identifier "USBS" is undefined
C:\Programme\IAR Systems\Ew23\avr\tutor\demo.c (22) :
Error[Pe020]: identifier "UCSZO" is undefined

Total number of errors: 5
Total number of warnings: 0

Gruss
Michael