# Setup Download and install the Dart source tree using the standard instructions for building Dart. To build for Fuchsia, you must first update your `.gclient` file with: ``` "custom_vars": { "download_fuchsia_deps": True, }, ``` and re-run `gclient sync`. # Building ```bash ./tools/build.py --mode=release --os=fuchsia --arch=arm64 create_sdk runtime ``` # Testing ```bash ./tools/test.py -nvm-fuchsia-release-arm64 -j4 ffi ```