/usr/lib/gcc/avr/4.1.0/include/aroarfw is in aroarfw-dev 0.1~beta5-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gcc/avr/4.1.0/include/../../../../../include/aroarfw
/usr/lib/gcc/avr/4.1.0/include/../../../../../include/aroarfw