Installing and Configuring b4
b4 is a utility for working with patches sent to a mailing list, such as devel@spectrum-os.org.
Installing b4
You should be able to install b4 from your package manager.
Using Nix, you can start a shell with b4 available by running:
nix-shell -p b4
Using b4
Using b4 to fetch and apply a patch from the Spectrum mailing list is described in the Testing Patches how-to guide.