From bb2a6f739679a5fdf42f2b78d621ae18b95cbaa0 Mon Sep 17 00:00:00 2001
From: Robin Gloster <mail@glob.in>
Date: Tue, 5 Nov 2019 21:19:11 +0100
Subject: [PATCH] treewide: structured attrs fixes

---
 pkgs/os-specific/darwin/apple-source-releases/xnu/default.nix | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pkgs/os-specific/darwin/apple-source-releases/xnu/default.nix b/pkgs/os-specific/darwin/apple-source-releases/xnu/default.nix
index aaa3a1ebe32..afa5dc1c08c 100644
--- a/pkgs/os-specific/darwin/apple-source-releases/xnu/default.nix
+++ b/pkgs/os-specific/darwin/apple-source-releases/xnu/default.nix
@@ -81,8 +81,8 @@ appleDerivation ({
     export DSTROOT=$out
   '';
 
-  buildFlags = lib.optionalString headersOnly "exporthdrs";
-  installTargets = lib.optionalString headersOnly "installhdrs";
+  buildFlags = lib.optional headersOnly "exporthdrs";
+  installTargets = lib.optional headersOnly "installhdrs";
 
   postInstall = lib.optionalString headersOnly ''
     mv $out/usr/include $out