restore make openlane behavior

openlane/Makefile

diff --git a/openlane/Makefile b/openlane/Makefile
index f6d3c93..6e4afc1 100644
--- a/openlane/Makefile
+++ b/openlane/Makefile
@@ -77,3 +77,21 @@
 	@cp ./$*/runs/$*/PDK_SOURCES ../signoff/$*/
 	@cp ./$*/runs/$*/reports/*.csv ../signoff/$*/
 
+.PHONY: openlane
+openlane: check-openlane-env
+	if [ -d "$(OPENLANE_ROOT)" ]; then\
+		echo "Deleting exisiting $(OPENLANE_ROOT)" && \
+		rm -rf $(OPENLANE_ROOT) && sleep 2; \
+		fi
+	git clone https://github.com/The-OpenROAD-Project/OpenLane --branch=$(OPENLANE_TAG) --depth=1 $(OPENLANE_ROOT) && \
+		cd $(OPENLANE_ROOT) && \
+		export OPENLANE_IMAGE_NAME=efabless/openlane:$(OPENLANE_TAG) && \
+		export IMAGE_NAME=efabless/openlane:$(OPENLANE_TAG) && \
+		$(MAKE) pull-openlane
+
+.PHONY: check-openlane-env
+check-openlane-env:
+	ifeq ($(OPENLANE_ROOT),)
+	@echo "Please export OPENLANE_ROOT"
+	@exit 1
+endif