Building help

https://firefox-source-docs.mozilla.org/testing/geckodriver/Building.html

Github

https://github.com/mozilla/geckodriver    

Source

https://hg.mozilla.org/mozilla-central/file/tip/testing/geckodriver

Download source

#curl https://hg.mozilla.org/mozilla-central/archive/tip.zip/testing/geckodriver/ > t.zip
curl https://hg.mozilla.org/mozilla-central/archive/tip.zip/testing/ > t.zip
unzip t.zip

Build

Install RUST

curl https://sh.rustup.rs -sSf | sh

Install cross-compiler toolchain:

apt install gcc-arm-linux-gnueabihf libc6-armhf-cross libc6-dev-armhf-cross

Create a new shell, or to reuse the existing shell:

source $HOME/.cargo/env

#Install rustc target toolchain:

rustup target install armv7-unknown-linux-gnueabihf

Put this in testing/geckodriver/.cargo/config:

[target.armv7-unknown-linux-gnueabihf]
linker = "arm-linux-gnueabihf-gcc"

Build geckodriver from testing/geckodriver:

cd testing/geckodriver
cargo build --release --target armv7-unknown-linux-gnueabihf

Grab it!

cp "./mozilla-central-cd7d8aad0306/testing/geckodriver/target/armv7-unknown-linux-gnueabihf/release/geckodriver" ./