From f93470d7a318d91740120e45f8cc6455bc7c56ef Mon Sep 17 00:00:00 2001
From: Michael Eden <themichaeleden@gmail.com>
Date: Tue, 12 Mar 2019 09:07:36 -0400
Subject: [PATCH] rust: set PKG_CONFIG_ALLOW_CROSS conditionally in
 buildRustPackage

---
 pkgs/build-support/rust/default.nix | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkgs/build-support/rust/default.nix b/pkgs/build-support/rust/default.nix
index 028390640d10..2579c97b99e8 100644
--- a/pkgs/build-support/rust/default.nix
+++ b/pkgs/build-support/rust/default.nix
@@ -56,6 +56,9 @@ in stdenv.mkDerivation (args // {
 
   patches = cargoPatches ++ patches;
 
+  PKG_CONFIG_ALLOW_CROSS =
+    if stdenv.buildPlatform != stdenv.hostPlatform then 1 else 0;
+
   postUnpack = ''
     eval "$cargoDepsHook"