[polari] build: Shut up some automake warnings

[Florian Müllner <fmuellner src gnome org>]

commit 74379575bf660e273f409716c47f46836fba286d
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Dec 3 22:16:33 2014 +0100

    build: Shut up some automake warnings

 configure.ac |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 95ac671..a0563fd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5,7 +5,7 @@ AC_CONFIG_AUX_DIR([build-aux])
 
 m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
 
-AM_INIT_AUTOMAKE([1.11 dist-xz no-dist-gzip tar-ustar foreign])
+AM_INIT_AUTOMAKE([1.11 dist-xz no-dist-gzip tar-ustar foreign subdir-objects])
 AM_MAINTAINER_MODE([enable])
 
 GETTEXT_PACKAGE=AC_PACKAGE_NAME
@@ -15,6 +15,7 @@ IT_PROG_INTLTOOL([0.50.0])
 GOBJECT_INTROSPECTION_REQUIRE([0.9.6])
 
 # Initialize libtool
+AM_PROG_AR
 LT_PREREQ([2.2])
 LT_INIT([disable-static])