On an Ubuntu 16.04 x86_64/AMD64 system :
# sudo apt install build-essential bc git qemu debootstrap qemu-user-static
# ./init.sh
# ./build_linux.sh
# sudo ./linux-image.sh
# sudo ./clean.sh
Image will be in the same directory.
Simply dd it onto an SDCard like :
# sudo dd if=aml-s905x-cc-ubuntu-xenial-linux-libretech-4.13.3-g5bb7f41-2017-09-21.img of=/dev/mmcblk0 bs=8M
Enjoy !