Index: Makefile
===================================================================
--- Makefile	(revision e8f6f94c5180703f29cf800251082aa6fca19cb3)
+++ Makefile	(revision 742fc98ed97374a32d3801aba30786b37c425e30)
@@ -103,5 +103,5 @@
 	$(CHECK) -j $(JOBS)
 else
-	$(CHECK)
+	$(CHECK) -j $(shell nproc)
 endif