From 1b86532a9910fbb70b673e9e733a9afd3bcdeb31 Mon Sep 17 00:00:00 2001
From: Anders Kaseorg <andersk@mit.edu>
Date: Sat, 5 May 2012 16:37:22 -0400
Subject: [PATCH] =?UTF-8?q?Only=20use=20AM=5FPROG=5FAR=20if=20it=E2=80=99s?=
 =?UTF-8?q?=20defined?=
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Fixes
  aclocal:configure.ac:22: warning: macro `AM_PROG_AR' not found in library
and
  ./configure: line 4024: AM_PROG_AR: command not found
with old automake.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>
---
 configure.ac | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index aed8604..f2670a7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,8 +18,7 @@ AS_IF([test x"$PROTOC" = x],
   [AC_MSG_ERROR([cannot find protoc, the Protocol Buffers compiler])])
 
 # automake 1.12 seems to require this, but automake 1.11 doesn't recognize it
-m4_pattern_allow([AM_PROG_AR])
-AM_PROG_AR
+m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 
 WARNING_CXXFLAGS=""
 PICKY_CXXFLAGS=""