This is a pre-build binary for raspberry-pi 3.
New binary will be built when there is a new release.
sudo curl -L https://github.com/mjuu/rpi-docker-compose/blob/master/v1.12.0/docker-compose-v1.12.0?raw=true -o /usr/local/bin/docker-compose && sudo chmod +x /usr/local/bin/docker-compose
Guide to build docker-compose from source Getting docker-compose on raspberry pi the easy way