Hi Nick - wow, thank you very much for that detailed reply! I had no idea ...
it works in a very simple way I'm not sure I'd call anything about the dependency tracking "very simple" :). and it is relatively straightforward to extend it. Thanks again. I think I'll link to your message in the doc somewhere ... >From all this info, I'm guessing you had occasion to actually do this extension. Is it available somewhere? You should not expect hooking any undocumented internals to continue working if you switch to a different version of Automake. Agreed, we never know, but hopefully the dep tracking won't change again unless some major reason to do so appears. Thanks again, Karl