--- concordance-1.0/libconcord/configure.ac.0000	2013-04-10 12:32:16.000000000 +0800
+++ concordance-1.0/libconcord/configure.ac	2013-07-31 15:59:28.649668239 +0800
@@ -1,5 +1,6 @@
 AC_INIT([libconcord], [1.0], [bug-automake@gnu.org])
-AM_INIT_AUTOMAKE([-Wall -Werror foreign])
+AM_INIT_AUTOMAKE([-Wall -Werror foreign subdir-objects])
+AM_PROG_AR
 AC_CONFIG_MACRO_DIR([m4])
 AC_PROG_LIBTOOL
 AC_PROG_CXX