or ./mach run -r -- , depending on the build profile you want to run. For example, both of the commands below run the debug build of servoshell with the same options: Runtime dependencies On Linux, and updating dependencies. Windows users: you will need to replace ./mach with .\mach in the commands in this book if you are using cmd. Use --help to list the subcommands, or get help with a specific manually. Simply enable the Android build support running: in the shell session before invoking ./mach commands sudo $ANDROID_SDK_ROOT/cmdline-tools/latest/bin/sdkmanager --install \ "build-tools;34.0.0" \