# Generate new gn json files and moz.build files for building libwebrtc in our tree /!\ This is only supported on Linux and macOS. If you are on Windows, you can run the script under [WSL](https://docs.microsoft.com/en-us/windows/wsl/install). 1. The script should be run from the top directory of our firefox tree. ``` ./mach python python/mozbuild/mozbuild/gn_processor.py dom/media/webrtc/third_party_build/gn-configs/webrtc.json ``` 2. Checkin all the generated/modified files and try your build! # Adding new configurations to the build Edit the `main` function in the `python/mozbuild/mozbuild/gn_processor.py` file.