Another place where the default behavior frequently breaks is if one is
applying a patch to both the generated file and the source file, usually
because one explicitly *doesn't* want to re-run Automake (often because
there's some incompatibility with the latest version) and one has
carefully determined the right change to make to the generated file and is
also patching the source for documentation purposes. If patch happens to
patch the generated file before the source file, make then tries to re-run
Automake and everything explodes.