Copying headers, libraries from subdirs to top-level include, lib in "make all"

[Fred Proctor]

I have code in some subdirectories, say src/{bottom,middle,top}, which 
when compiled yields libraries that I want copied up to the top-level 
include/ and lib/ directories. Code in middle/ will reference headers 
and libs from bottom/, code from top/ will reference headers and libs 
from middle/ and bottom/.

How can I get these headers and libs copied up during the "make all" 
default target?

--Fred