Add a check to verify that the node version is proper

Makefile

@@ -56,14 +56,17 @@ install: node_modules
 run: welcome githooks-commit install build
 	@$(NODE) build/bundle-$(CALYPSO_ENV).js
 
+node-version:
+	@$(BIN)/check-node-version
+
 # a helper rule to ensure that a specific module is installed,
 # without relying on a generic `npm install` command
-node_modules/%:
+node_modules/%: node-version
 	@$(NPM) install $(notdir $@)
 
 # ensures that the `node_modules` directory is installed and up-to-date with
 # the dependencies listed in the "package.json" file.
-node_modules: package.json
+node_modules: package.json node-version
 	@$(NPM) prune
 	@$(NPM) install
 	@touch node_modules
@@ -157,5 +160,5 @@ githooks-push:
 FORCE:
 
 .PHONY: build build-development build-server
-.PHONY: run install test clean distclean translate route
+.PHONY: run install test clean distclean translate route node-version
 .PHONY: githooks githooks-commit githooks-push

bin/check-node-version

@@ -0,0 +1,8 @@
+#!/usr/bin/env node
+const requiredVersion = require( '../package' ).engines.node,
+	semver = require( 'semver' );
+
+if ( ! semver.satisfies( process.version, requiredVersion ) ) {
+	console.error( 'wp-calypso requires node ' + requiredVersion + '. Please upgrade! See https://nodejs.org for instructions.' );
+	process.exitCode = 1;
+}