From c38dbcc6b558d9c01e6316b1b3cbbf4836626607 Mon Sep 17 00:00:00 2001
From: Miroslav Lichvar <mlichvar@redhat.com>
Date: Fri, 15 Nov 2013 13:21:40 +0100
Subject: [PATCH] Link with -lrt for clock_gettime() if needed

---
 configure | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/configure b/configure
index e508f59..98541f7 100755
--- a/configure
+++ b/configure
@@ -454,7 +454,16 @@ if [ $feat_phc = "1" ] && [ $try_phc = "1" ] && \
   test_code '<linux/ptp_clock.h>' 'sys/ioctl.h linux/ptp_clock.h' '' '' \
     'ioctl(1, PTP_CLOCK_GETCAPS, 0);'
 then
+  if test_code 'clock_gettime()' 'time.h' '' '' 'clock_gettime(0, NULL);'; then
     add_def FEAT_PHC
+  else
+    if test_code 'clock_gettime() in -lrt' 'time.h' '' '-lrt' \
+      'clock_gettime(0, NULL);'
+    then
+      EXTRA_LIBS="$EXTRA_LIBS -lrt"
+      add_def FEAT_PHC
+    fi
+  fi
 fi
 
 if [ $try_setsched = "1" ] && \