Credits:

• LCD Rounded font by Jecko Development (http://www.jeckodevelopment.com)

Install ARM toolchains:

cargo install cross
rustup target add aarch64-unknown-linux-gnu   # 64-bit Pi OS
rustup target add armv7-unknown-linux-gnueabihf  # 32-bit Pi 2/3/4 OS
rustup target add arm-unknown-linux-gnueabihf    # ARMv6 (Pi Zero/1)

sudo apt-get update
sudo apt-get install gcc-aarch64-linux-gnu gcc-arm-linux-gnueabihf

Cross-compile

# 2) Build
~/.cargo/bin/cross build --target aarch64-unknown-linux-gnu --release
~/.cargo/bin/cross build --target armv7-unknown-linux-gnueabihf --release
~/.cargo/bin/cross build --target arm-unknown-linux-gnueabihf --release