--- a/libconcord/configure.ac~	2012-11-07 20:08:13.955244712 +0800
+++ b/libconcord/configure.ac	2012-11-07 20:08:57.046292469 +0800
@@ -1,5 +1,6 @@
 AC_INIT([libconcord], [0.24], [bug-automake@gnu.org])
 AM_INIT_AUTOMAKE([-Wall -Werror foreign])
+AM_PROG_AR
 AC_CONFIG_MACRO_DIR([m4])
 AC_PROG_LIBTOOL
 AC_PROG_CXX