agregar a :
cat sources.list
deb http://mirrordirector.raspbian.org/raspbian/ wheezy main contrib non-free rpi
deb-src http://mirrordirector.raspbian.org/raspbian/ wheezy main contrib non-free rpi
apt-get update
apt-get build-dep unrar-nonfree
apt-get source -b unrar-nonfree