diff -ur libidn-1.9-orig/configure.ac libidn-1.9/configure.ac
--- libidn-1.9-orig/configure.ac	2013-12-24 15:51:24.035913728 +0000
+++ libidn-1.9/configure.ac	2013-12-24 16:39:55.968622080 +0000
@@ -28,6 +28,7 @@
 AC_SUBST(LT_REVISION, 38)
 AC_SUBST(LT_AGE, 5)
 
+AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_AUX_DIR([build-aux])
 AM_INIT_AUTOMAKE([1.10])
 AB_INIT
