This page describes how to build Tor Browser for the Android OS based on Fenix.
In general, building Android Tor Browser uses [Tor Browser Build](https://gitlab.torproject.org/tpo/applications/tor-browser-build) and the application with all of its dependencies are reproducibly built. The following steps provide a better development environment for faster iteration, but the resulting app is likely not reproducible.
The main difficulty of locally building Fenix is the dependency on tpo/applications/tor-browser> and tpo/applications/android-components>. There are two way of providing these dependencies.