From e8da9159fb75b1bd37bc992d5c11635c83fba819 Mon Sep 17 00:00:00 2001
From: Michael Neumann <mneumann@ntecs.de>
Date: Sat, 6 Aug 2016 22:01:51 +0200
Subject: [PATCH] Fix build on DragonFly (unused function errno_location)

Function errno_location() is not used on DragonFly. As warnings are
errors, this breaks the build.
---
 src/libstd/sys/unix/os.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libstd/sys/unix/os.rs b/src/libstd/sys/unix/os.rs
index 4c3558f91f5f2..33c526532c7a8 100644
--- a/src/libstd/sys/unix/os.rs
+++ b/src/libstd/sys/unix/os.rs
@@ -37,6 +37,7 @@ static ENV_LOCK: Mutex = Mutex::new();
 
 
 extern {
+    #[cfg(not(target_os = "dragonfly"))]
     #[cfg_attr(any(target_os = "linux", target_os = "emscripten"),
                link_name = "__errno_location")]
     #[cfg_attr(any(target_os = "bitrig",