dependencies across directories

Hello,

I have a problem with dependencies across directories. Let
me describe it:

We have the following directory structure:

/tmp/makefiletest/
   makefile.inc
   A/
     a.h
     a1.h
     makefile
   B/
     b.cc
     makefile

makefile.inc
---
VPATH /tmp/makefiletest

A/makefile
---
a.h: a1.h
   touch $

B/makefile
---
b.o: A/a.h

/tmp/makefiletest/B> make b.o

The goal of this test if to have b.cc recompiled if a.h or
a1.h changes. 
If a.h changes, it works, but if a1.h changes it does not
work. I am 
aware that the A/makefile file is not read, and so the
dependency 
between a1.h and a.h is not discovered.

We follow this makefile pattern for our codebase, and only
recently I 
discovered this "bug" in our pattern. Is there an
easy way to fix it 
without braking everything?

Thanks,
Ray






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