We add the bins from all deps instead. Rationale: formula find and use eg. GNU-coreutils versions of things and then break. Only allow formula to use tools that they depend on and expect.
I want to go further and only add include paths etc. for dependencies, I have done some work on this, but I fear it may be impossible. If an include path is eg. /usr/local/lib/foo/include, is it possible to know if this path is bad? Not always AFAICT.
