From 481a9fa34a4c1bf2e75b0cdf848fffd8b967309a Mon Sep 17 00:00:00 2001
From: Alexey Kopytov <akopytov@gmail.com>
Date: Sun, 5 Feb 2017 10:31:41 +0100
Subject: [PATCH] Fixes #105: 1.0.0 clock_gettime runtime failure built with
 macOS 10.11 and Xcode 8.x

XCode 8 SDK declares clock_gettime() but macOS 10.11 and earlier do not
actually implement it. So just checking for a clock_gettime()
declaration in configure is insufficient.

Instead, do AC_SEARCH_LIBS first to check if -lrt is required, then use
AC_CHECK_FUNCS to check for clock_gettime() availability.
---
 configure.ac | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/configure.ac b/configure.ac
index 6d37cbf..0321282 100644
--- a/configure.ac
+++ b/configure.ac
@@ -330,13 +330,6 @@ AC_CHECK_SIZEOF(size_t)
 AC_FUNC_MMAP
 AC_FUNC_STRERROR_R
 
-AC_CHECK_DECL([clock_gettime], 
-    AC_DEFINE([HAVE_CLOCK_GETTIME], 1, [Define if you have clock_gettime() declared in <time.h>]),,
-    [
-#define _XOPEN_SOURCE 500
-#include <time.h>
-    ]
-)
 AC_SEARCH_LIBS([clock_gettime], [rt]) 
 
 save_CFLAGS="$CFLAGS"
@@ -346,6 +339,7 @@ LIBS="$PTHREAD_LIBS $LIBS"
 
 AC_CHECK_FUNCS([ \
 alarm \
+clock_gettime \
 directio \
 fdatasync \
 gettimeofday \