From 1ab8f5a3c5697013c8cf00bfefa896e005f38aff Mon Sep 17 00:00:00 2001
From: Ben Noordhuis <info@bnoordhuis.nl>
Date: Fri, 30 Mar 2012 22:39:33 +0200
Subject: [PATCH] Conditionally define __unused.
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Fixes compiler warning '"__unused" redefined' on OS X.

Reported by Saúl Ibarra Corretgé.
---
 include/uv-private/tree.h | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/include/uv-private/tree.h b/include/uv-private/tree.h
index eb05cdcd..f070928f 100644
--- a/include/uv-private/tree.h
+++ b/include/uv-private/tree.h
@@ -26,10 +26,12 @@
 #ifndef  UV_TREE_H_
 #define  UV_TREE_H_
 
-#if __GNUC__
-# define __unused __attribute__((unused))
-#else
-# define __unused
+#ifndef __unused
+# if __GNUC__
+#  define __unused __attribute__((unused))
+# else
+#  define __unused
+# endif
 #endif
 
 /*