From original discussion:
Something to note, as this is now the required way of integration with U-Boot environment in dunfell all "older" U-Boot forks are required to apply this patch. You get a build error if you do not have this patch. I suspect that people will hit this, as there are a lot of U-Boot forks out there and I think as a minimum we should add something to troubleshooting in docs.
Best would be if we could do some automatic detection, but details remain to be figured out.