From 374648deaab5e8cacaa21b7d514375f6d8c42695 Mon Sep 17 00:00:00 2001
From: Joel Taylor <me@joelt.io>
Date: Thu, 21 Aug 2014 16:40:14 -0700
Subject: [PATCH] X11 build purity

---
 pkgs/servers/x11/xorg/overrides.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkgs/servers/x11/xorg/overrides.nix b/pkgs/servers/x11/xorg/overrides.nix
index 66f74f30549..7073adb85dd 100644
--- a/pkgs/servers/x11/xorg/overrides.nix
+++ b/pkgs/servers/x11/xorg/overrides.nix
@@ -69,7 +69,9 @@ in
   };
 
   libX11 = attrs: attrs // {
-    preConfigure = setMalloc0ReturnsNullCrossCompiling;
+    preConfigure = setMalloc0ReturnsNullCrossCompiling + ''
+      sed 's,^as_dummy.*,as_dummy="\$PATH",' -i configure
+    '';
     postInstall =
       ''
         # Remove useless DocBook XML files.