From bfe0207a7a7fed8e9fe8643fbd99d5f15abefaad Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Mon, 8 Jul 2013 01:53:59 +0200
Subject: configure: link with -lrt

In order to use clock_gettime() (which we need for use with
pthread_cond_timedwait()), most glibc versions need to link with -lrt.
---
 configure | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/configure b/configure
index 2c9b98e04d..9299a0c26d 100755
--- a/configure
+++ b/configure
@@ -1271,6 +1271,22 @@ else
 fi
 echores "$_pthreads"
 
+if test "$_pthreads" = yes ; then
+
+# Cargo-cult for -lrt, which is needed on not so recent glibc version for
+# clock_gettime. It's documented as required before before glibc 2.17, which
+# was released in december 2012. On newer glibc versions or on other systems,
+# this will hopefully do nothing.
+echocheck "linking with -lrt"
+_rt=no
+cc_check "-lrt" && _rt=yes
+if test "$_rt" = yes ; then
+  _ld_pthread="$_ld_pthread -lrt"
+fi
+echores "$_rt"
+
+fi
+
 echocheck "stream cache"
 _stream_cache="$_pthreads"
 if test "$_stream_cache" = yes ; then
-- 
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