From abb8ef619ba2fab3ae16fb5b5430215905bac723 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 26 Nov 2019 21:08:56 +0100
Subject: [PATCH] Fix macOS build

https://hydra.nixos.org/build/107457009
---
 src/libmain/shared.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
index d3dbfbc44..81fb6b05a 100644
--- a/src/libmain/shared.cc
+++ b/src/libmain/shared.cc
@@ -155,7 +155,7 @@ void initNix()
        sshd). This breaks build users because they don't have access
        to the TMPDIR, in particular in ‘nix-store --serve’. */
 #if __APPLE__
-    if (getuid() == 0 && hasPrefix(getEnv("TMPDIR"), "/var/folders/"))
+    if (getuid() == 0 && hasPrefix(getEnv("TMPDIR").value_or("/tmp"), "/var/folders/"))
         unsetenv("TMPDIR");
 #endif
 }