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Fix libgcrypt build under x86_64
See https://www.redhat.com/archives/libguestfs/2013-February/msg00102.html

From e19ba5689148df7cdcb6c515f44a897cc3a08418 Mon Sep 17 00:00:00 2001
From: Boris Nagaev <bnagaev@gmail.com>
Date: Sun, 28 Jun 2015 17:17:25 +0200
Subject: [PATCH] configure.ac: no serial-tests if automake < 1.12

---
 configure.ac |   19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index ab98441..a015787 100644
--- a/configure.ac
+++ b/configure.ac
@@ -71,7 +71,24 @@ VERSION=$PACKAGE_VERSION
 
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_SRCDIR([src/libgcrypt.vers])
-AM_INIT_AUTOMAKE([serial-tests dist-bzip2])
+
+dnl Initialize automake.  automake < 1.12 didn't have serial-tests and
+dnl gives an error if it sees this, but for automake >= 1.13
+dnl serial-tests is required so we have to include it.  Solution is to
+dnl test for the version of automake (by running an external command)
+dnl and provide it if necessary.  Note we have to do this entirely using
+dnl m4 macros since automake queries this macro by running
+dnl 'autoconf --trace ...'.
+m4_define([serial_tests], [
+    m4_esyscmd([automake --version |
+                head -1 |
+                awk '{split ($NF,a,"."); if (a[1] == 1 && a[2] >= 12) { '\
+                    'print "serial-tests" }}'
+    ])
+])
+dnl NB: Do not [quote] this parameter.
+AM_INIT_AUTOMAKE(serial_tests dist-bzip2)
+
 AC_CONFIG_HEADER(config.h)
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_LIBOBJ_DIR([compat])
-- 
1.7.10.4