diff --git a/build/autoconf/acgeneral.m4 b/build/autoconf/acgeneral.m4
index 772622849ba21..ca63d77732b45 100644
--- a/build/autoconf/acgeneral.m4
+++ b/build/autoconf/acgeneral.m4
@@ -1,3 +1,5 @@
+//test
+
 dnl Parameterized macros.
 dnl Requires GNU m4.
 dnl This file is part of Autoconf.