This documentation previously located on the wiki You can read the documentation for the legacy Crazy Fun Build tool. Building Selenium with Buck The easiest thing to do is to just run “./go”. The build process will download the right version of Buck for you so long as there’s no .nobuckcheck file in the root of the project. The download ends up in buck-out/crazy-fun/HASH/buck.pex where HASH is the value of the current buck version (given in the .