diff --git a/configure.in b/configure.in
index 98f9fff0c..75fac646c 100644
--- a/configure.in
+++ b/configure.in
@@ -12,6 +12,7 @@ AC_PROG_CPP
 AC_PROG_CC_STDC
 
 AM_INIT_AUTOMAKE
+AM_MAINTAINER_MODE
 
 AC_PREFIX_DEFAULT(/usr/heimdal)