sudo dpkg --add-architecture armhf
sudo apt-get update
sudo apt-get install libc6:armhf
sudo ln -s /lib/ld-linux-armhf.so.3 /lib/ld-linux.so.3
sudo sh -c 'echo "deb [arch=armhf] http://linux-packages.getsync.com/btsync/deb btsync non-free" > /etc/apt/sources.list.d/btsync.list
wget -qO - http://linux-packages.getsync.com/btsync/key.asc | sudo apt-key add -
sudo apt-get update
sudo apt-get install btsync