Add a check target.
diff --git a/Makefile b/Makefile
index 30412c8..44ea53f 100644
--- a/Makefile
+++ b/Makefile
@@ -403,6 +403,9 @@
 
 
 
-.PHONY: tags
+.PHONY: tags check
 tags:
 	ctags -R .
+
+check: busybox
+	cd testsuite && ./runtest