First of all install eta
git clone https://github.com/ayopa/eta.git
cd eta
makepkg -i
Then build the agora packages
git clone https://github.com/ayopa/agora.git
cd agora
sudo eta-build
Construct the root filesystem and commit it
sudo eta-commit
Create the OS image
sudo eta-pack
Copy it to an USB drive
sudo dd if=out/agora.img of=/dev/sd[X] bs=1M