From ec1f5273be3c485eefce7241a5729a581ecf92ba Mon Sep 17 00:00:00 2001
From: jzmaddock <jzmaddock@gmail.com>
Date: Mon, 20 Oct 2014 12:53:40 +0100
Subject: [PATCH] Presence of pthread_yield is dependent on __USE_GNU.

---
 include/boost/config/platform/linux.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/boost/config/platform/linux.hpp b/include/boost/config/platform/linux.hpp
index a02aff78..6fa5f45b 100644
--- a/include/boost/config/platform/linux.hpp
+++ b/include/boost/config/platform/linux.hpp
@@ -72,7 +72,9 @@
 // boilerplate code:
 #define BOOST_HAS_UNISTD_H
 #include <boost/config/posix_features.hpp>
+#ifdef __USE_GNU
 #define BOOST_HAS_PTHREAD_YIELD
+#endif
 
 #ifndef __GNUC__
 //