Two distinct makefile directories are in use:
Makefile logic is loaded/accessed through make macros: ONF_MAKEDIR= Common makefile targets and logic MAKEDIR= Repository/project specific targets
Common library targets are defined/augmented as double colon rules: build clean help sterile test :: # dup targets OK
% make sterile test
All other targets are defined and accessed as single colon rules: repo-rule : # fail on duplicate targets
TOP ?= $(strip $(dir $(abspath $(lastword $(MAKEFILE_LIST))) ) )
include $(TOP)/config.mk include $(TOP)/makefiles/include.mk
include $(ONF_MAKE)/makefiles/include.mk include $(MAKEDIR)/makefiles/include.mk
% make sterile build