Output node min version variable (#15562)

Makefile

@@ -210,9 +210,10 @@ git-check:
 .PHONY: node-check
 node-check:
 	$(eval NODE_VERSION := $(shell printf "%03d%03d%03d" $(shell node -v | cut -c2- | tr '.' ' ');))
+	$(eval MIN_NODE_VER_FMT := $(shell printf "%g.%g.%g" $(shell echo $(MIN_NODE_VERSION) | grep -o ...)))
 	$(eval NPM_MISSING := $(shell hash npm > /dev/null 2>&1 || echo 1))
 	@if [ "$(NODE_VERSION)" -lt "$(MIN_NODE_VERSION)" -o "$(NPM_MISSING)" = "1" ]; then \
-		echo "Gitea requires Node.js 10 or greater and npm to build. You can get it at https://nodejs.org/en/download/"; \
+		echo "Gitea requires Node.js $(MIN_NODE_VER_FMT) or greater and npm to build. You can get it at https://nodejs.org/en/download/"; \
 		exit 1; \
 	fi