variable value lost with "include" directive

I am having something like below:

$pwd/Makefile:

VPATH:= ./foo:./boo
include ../../bin/Makefile


and in ../../bin/Makefile:

VPATH+=../include

target1:include_file1 file_from_directory_foo file_from_directory_boo
<TAB>gcc $^


When I attempt running in $pwd

%gmake target_1

It complains about include_file not found.
I suspect this is beacuse the value of VPATH is not carried through
when I include another Makefile

Am I missing something?

--
Aditya Kher
http://kher.org


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