--- Makefile.orig	2017-03-21 13:20:48 UTC
+++ Makefile
@@ -36,7 +36,6 @@ build: build/$(BUILD_STAMP)
 
 build/$(BUILD_STAMP): $(SRCFILES)
 	$(PYTHON) setup.py build $(BUILD_ARGS)
-	touch $@
 
 docs: build
 	PYTHONPATH=build/$(BUILD_DIR) $(SPHINX) -b html sphinx/ $(DOCS_OUTPUT)