Dependancy DB & recursive make

[Tristan Van Berkom]

Hi all,
    I have an incremental recursive make environment where every src
directory evaluates the dependancy files of its dependancy directories
to see if make should recurse to build those dependancies in other
directories;

example:
    `application' depends on `library', so `application' includes the
    dependancies previously generated by `gcc' from `library' directory.

The problem is that dependancies are not getting re-evaluated over
sub-makes; resulting in useless `$(MAKE)' invokations.

example:
    - `app' depends on `lib-one' and `lib-two'
    - `lib-two' depends on `lib-one'
      - make in `app' dir recurses into `lib-one' and rebuilds
      - make in `app' dir recurses into `lib-two'
        - make in `lib-two' dir recurses into `lib-one' dir
          (Nothing to do in lib-one dir "duh !")
      - make in `lib-two' dir rebuilds
      - make in `app' dir rebuilds

Is there anything I can do so that make updates its table of
dependancies properly or sub-makes start off with a clean slate of 
dependancies ?

Cheers,
                         -Tristan