The main ungoogled-chromium repository only contains the common code for all platforms; it does not contain all the configuration and scripts necessary to build ungoogled-chromium. Most users will want to use platform-specific repos, where all the remaining configuration and scripts are provided for specific platforms:
If you wish to include ungoogled-chromium code in your own build process, consider using the tags of the main repo. These tags follow the format
chromium_versionis the version of Chromium used in
revisionis a number indicating the version of ungoogled-chromium for the corresponding Chromium version.
Additionally, most platform-specific repos extend their tag scheme upon this one.
Building the source code: See docs/building.md