From beda0365a64f025c26212cb69ffbb09f3ef329fd Mon Sep 17 00:00:00 2001
From: John Ericson <John.Ericson@Obsidian.Systems>
Date: Thu, 7 Nov 2019 15:12:29 -0500
Subject: [PATCH] darwin private frameworks setup hook: NIX_CFLAGS_COMPILE may
 be undefined

---
 .../darwin/apple-sdk/private-frameworks-setup-hook.sh           | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/os-specific/darwin/apple-sdk/private-frameworks-setup-hook.sh b/pkgs/os-specific/darwin/apple-sdk/private-frameworks-setup-hook.sh
index fbd977f8552d..a351c39de130 100644
--- a/pkgs/os-specific/darwin/apple-sdk/private-frameworks-setup-hook.sh
+++ b/pkgs/os-specific/darwin/apple-sdk/private-frameworks-setup-hook.sh
@@ -1,6 +1,6 @@
 addPrivateFrameworks() {
     flag="-F/System/Library/PrivateFrameworks"
-    if [[ "$NIX_CFLAGS_COMPILE" != *$flag* ]]; then
+    if [[ "${NIX_CFLAGS_COMPILE-}" != *$flag* ]]; then
         NIX_CFLAGS_COMPILE+=" $flag"
     fi
 }