Build

Before

Create toolchain_path.txt with the path to your toolchain.

Mine looks like this

../gcc-linaro-5.4.1-2017.05-i686_aarch64-linux-gnu/bin/aarch64-linux-gnu-

Build

Just run the script.

./build.sh

Alternative (for custom build)

Compile like this

make mido_defconfig
make

Generate the flashable zip like this.

./script-generate-zimage-miui.sh