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ifneq ($(lastword a b),b)
$(error This Makefile require make 3.81 or newer)
endif
# Set TOP to be the path to get from the current directory (where make was
# invoked) to the top of the tree. $(lastword $(MAKEFILE_LIST)) returns
# the name of this makefile relative to where make was invoked.
THIS_MAKEFILE := $(lastword $(MAKEFILE_LIST))
TOP := $(patsubst %/tools/top.mk,%,$(THIS_MAKEFILE))
TOP := $(shell realpath $(TOP))
$(info Top directory is $(TOP))
CURRENT_PATH := $(shell realpath --relative-to=$(TOP) `pwd`)
$(info Path from top is $(CURRENT_PATH))
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