Thanks, unfortunately there is no .DependencyInfo generated after a clean.
I found this post:
… which along with the subsequent post suggests that I am barking up the wrong tree, at least as far as x86_64 Haiku goes at the moment. In that thread there are reports that QtCreator + CMake is a working solution to the modern autocomplete/code analysis conundrum, but alas it is not in a working state here either.