From b67466576531959ca298fcfce4f0bf379515f8e5 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Fri, 14 Sep 2012 10:18:27 -0400
Subject: [PATCH] Test whether GNU tar understands --warning=no-timestamp

http://hydra.nixos.org/build/3031618
---
 configure.ac | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 17169c885..743bd8ddf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -340,8 +340,8 @@ AC_SUBST(dynlib_suffix)
 
 
 # Do we have GNU tar?
-AC_MSG_CHECKING([if you have GNU tar])
-if $tar --version 2> /dev/null | grep -q GNU; then
+AC_MSG_CHECKING([if you have a recent GNU tar])
+if $tar --version 2> /dev/null | grep -q GNU && tar cvf /dev/null --warning=no-timestamp ./configure > /dev/null; then
     AC_MSG_RESULT(yes)
     tarFlags="--warning=no-timestamp"
 else