From b1700a73361284c6c0132e6caf5e0345223f3010 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dani=C3=ABl=20de=20Kok?= <me@danieldk.eu>
Date: Thu, 3 Sep 2020 09:13:19 +0200
Subject: [PATCH] stdenv: unset SDKROOT on Darwin

The Rust `cc` crate started running `xcrun` when SDKROOT is defined:

https://github.com/alexcrichton/cc-rs/commit/a970b0ab0beecec1d9c589d2e6aa5f3ad1bd3f9b

Consequently, building crates that use newer versions of the `cc`
crate fail, because xcrun is not available in pure build environments.
---
 pkgs/stdenv/darwin/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/stdenv/darwin/default.nix b/pkgs/stdenv/darwin/default.nix
index 9de6ef63bfea..341b1f4b29c3 100644
--- a/pkgs/stdenv/darwin/default.nix
+++ b/pkgs/stdenv/darwin/default.nix
@@ -34,7 +34,7 @@ in rec {
     export NIX_ENFORCE_NO_NATIVE=''${NIX_ENFORCE_NO_NATIVE-1}
     export NIX_ENFORCE_PURITY=''${NIX_ENFORCE_PURITY-1}
     export NIX_IGNORE_LD_THROUGH_GCC=1
-    export SDKROOT=
+    unset SDKROOT
 
     export MACOSX_DEPLOYMENT_TARGET=${macosVersionMin}