how make interprets directory which are prerequisites

[sharan basappa]

When a directory itself is given as a prerequisite, how does make intrepret 
it ..
in the context of a recursive make, this is the example I see in a book ..
It is simple phony targets that are doing the trick or make has special
way to handle directories ..

lib_codec := lib/codec
lib_db := lib/db
lib_ui := lib/ui
libraries := $(lib_ui) $(lib_db) $(lib_codec)
player := app/player
.PHONY: all $(player) $(libraries)
all: $(player)
$(player) $(libraries):
$(MAKE) --directory=$@
$(player): $(libraries)
$(lib_ui): $(lib_db) $(lib_codec)

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