Credits:

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

Dependencies (Debian/Raspberry Pi OS)

• librust-openssl-dev
• protobuf-compiler
• libsdl3-dev
• libsdl3-ttf-dev

Install appimage package

cargo install cargo-appimage

Install ARM toolchains:

$ rustup target add aarch64-unknown-linux-gnu
$ rustup target add arm-unknown-linux-gnueabihf


$ sudo dpkg --add-architecture arm64
$ sudo dpkg --add-architecture armhf

$ sudo apt update 
$ sudo apt-get install gcc-aarch64-linux-gnu gcc-arm-linux-gnueabihf \
                       libc6-arm64-cross libc6-dev-arm64-cross gcc-aarch64-linux-gnu \
                       libc6-armhf-cross libc6-dev-armhf-cross gcc-arm-linux-gnueabihf \
                       libssl-dev libssl-dev:arm64 libsdl3-dev:arm64 libssl-dev:armhf libsdl3-dev:armhf

Cross-compile

ARM64

$ export PKG_CONFIG_SYSROOT_DIR=/usr/aarch64-linux-gnu/
$ cargo build --target aarch64-unknown-linux-gnu --release

$ export PKG_CONFIG_SYSROOT_DIR=/usr/arm-linux-gnueabihf/
$ cargo build --target arm-unknown-linux-gnueabihf --release