From 3c9f7b61fe384dbd2fd0be9530b9b24e8cc62d86 Mon Sep 17 00:00:00 2001
From: John Maddock <john@johnmaddock.co.uk>
Date: Sat, 20 Oct 2001 10:13:24 +0000
Subject: [PATCH] Fixed _XOPEN_REALTIME usage (was too liberal).

[SVN r11409]
---
 include/boost/config/posix_features.hpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/boost/config/posix_features.hpp b/include/boost/config/posix_features.hpp
index b0580f22..be1e0216 100644
--- a/include/boost/config/posix_features.hpp
+++ b/include/boost/config/posix_features.hpp
@@ -32,11 +32,16 @@
 
       // BOOST_HAS_NANOSLEEP:
       // This is predicated on _POSIX_TIMERS or _XOPEN_REALTIME:
-      // BOOST_HAS_CLOCK_GETTIME:
-      // This is predicated on _POSIX_TIMERS or _XOPEN_REALTIME:
 #     if (defined(_POSIX_TIMERS) && (_POSIX_TIMERS+0 >= 0)) \
              || (defined(_XOPEN_REALTIME) && (_XOPEN_REALTIME+0 >= 0))
 #        define BOOST_HAS_NANOSLEEP
+#     endif
+
+      // BOOST_HAS_CLOCK_GETTIME:
+      // This is predicated on _POSIX_TIMERS (also on _XOPEN_REALTIME
+      // but at least one platform - linux - defines that flag without
+      // defining clock_gettime):
+#     if (defined(_POSIX_TIMERS) && (_POSIX_TIMERS+0 >= 0))
 #        define BOOST_HAS_CLOCK_GETTIME
 #     endif