--- shadow-4.6/configure.ac.old	2018-06-23 22:09:31.067117872 -0500
+++ shadow-4.6/configure.ac	2018-06-23 22:13:44.496866959 -0500
@@ -1,5 +1,6 @@
 dnl Process this file with autoconf to produce a configure script.
 AC_PREREQ([2.64])
+AC_CONFIG_MACRO_DIR([m4])
 AC_INIT([shadow], [4.6], [pkg-shadow-devel@lists.alioth.debian.org], [],
 	[https://github.com/shadow-maint/shadow])
 AM_INIT_AUTOMAKE([1.11 foreign dist-xz])