diff -Nur libguess-1.1-orig/configure.ac libguess-1.1/configure.ac
--- libguess-1.1-orig/configure.ac	2011-12-01 14:00:59.000000000 +0100
+++ libguess-1.1/configure.ac	2013-04-21 10:04:36.606810657 +0200
@@ -5,6 +5,7 @@
 AC_INIT([libguess], [1.1], [bugs+libguess@atheme.org])
 AC_CONFIG_SRCDIR([src/libguess/guess.c])
 AC_CONFIG_HEADER([src/libguess/autoconf.h])
+AC_CONFIG_MACRO_DIR([m4])
 
 AC_CANONICAL_HOST
 AC_CANONICAL_TARGET