From 3e2f04cf2637054846acaf5cf19f765e29e60fed Mon Sep 17 00:00:00 2001
From: Rene Hopf <renehopf@mac.com>
Date: Tue, 6 Jan 2015 02:31:52 +0100
Subject: [PATCH] fix autogen.sh on OS X. This fixes bug #516.

---
 autogen.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/autogen.sh b/autogen.sh
index faa02353..26e17936 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -58,7 +58,7 @@ aclocal ${ACLOCAL_DIR} || exit 1
 # Check the version of a specific autoconf macro that tends to cause problems.
 CXXMACROVERSION=$(
 	grep -B 5 'm4_define(\[_AX_CXX_COMPILE_STDCXX_11_testbody\]' aclocal.m4 |
-	sed -nr 's/.*serial[[:space:]]+([[:digit:]]+).*/\1/p'
+	sed -n 's/.*serial[ \t][ \t]*\([0-9][0-9]*\).*/\1/p'
 )
 if [ "x$CXXMACROVERSION" = "x" ]; then
 	echo "--- Warning: AX_CXX_COMPILE_STDCXX_11 macro not found."