diff --git a/autogen.sh b/autogen.sh
index 3c19109..3f38d90 100644
--- a/autogen.sh
+++ b/autogen.sh
@@ -1,3 +1,6 @@
 #! /bin/sh
+set -e
+git submodule init
+git submodule update
 test -d m4 || mkdir m4
 autoreconf -f -i -s