Using avr-libc functions - how to?

How do i include files to use avr-libc functions?
Say for e.g. Can i write "#include <avr/interrupt.h>" ?

cheers,
Pracas

Yep. For examples, check out some of the libraries (source code hiding in something like .../hardware/libraries)
The servo library starts exactly with an "#include <avr/interrupt.h>"