diff --git a/Makefile b/Makefile
index f74f0706f..d57c736d5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,8 @@
-.PHONY: build copy serve clean
-build: build/katex.js
+.PHONY: build setup copy serve clean
+build: setup build/katex.js
+
+setup:
+	npm install
 
 compress: build/katex.min.js
 	@printf "Minified, gzipped size: "
diff --git a/build/.gitkeep b/build/.gitkeep
new file mode 100644
index 000000000..e69de29bb