From 6bbddcf7d1aa4f2365c2ac6383902080340c6ce2 Mon Sep 17 00:00:00 2001
From: John Wiegley <johnw@newartisans.com>
Date: Thu, 23 Feb 2017 11:32:32 -0800
Subject: [PATCH] xcbuild: Guard a glibc-only postPatch with \!isDarwin

---
 pkgs/development/tools/xcbuild/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/tools/xcbuild/default.nix b/pkgs/development/tools/xcbuild/default.nix
index 0fc56827de83..f2be61bd2139 100644
--- a/pkgs/development/tools/xcbuild/default.nix
+++ b/pkgs/development/tools/xcbuild/default.nix
@@ -32,7 +32,7 @@ in stdenv.mkDerivation rec {
   '';
 
   # Avoid a glibc >= 2.25 deprecation warning that gets fatal via -Werror.
-  postPatch = ''
+  postPatch = stdenv.lib.optionalString (!stdenv.isDarwin) ''
     sed 1i'#include <sys/sysmacros.h>' \
       -i Libraries/xcassets/Headers/xcassets/Slot/SystemVersion.h
   '';