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ifneq ($(EXTERNAL_3PDD_TARBALL),)
TAR_OPT_STRIP_COMPONENTS ?= --strip-components
prepare_tree: $(OUT)/target/kbuild/external
$(OUT)/target/kbuild/external: eurasiacon/external/$(EXTERNAL_3PDD_TARBALL)
	@echo "Extracting $<.."
	@mkdir -p $@
	@tar $(TAR_OPT_STRIP_COMPONENTS) 1 --touch -jxf $< -C $@
	@touch $(OUT)/target/kbuild/external
endif