From 9e5b2d5e3d517ec915ff2472f95967e504f392b7 Mon Sep 17 00:00:00 2001
From: Thomas Tuegel <ttuegel@gmail.com>
Date: Fri, 11 Mar 2016 09:10:10 -0600
Subject: [PATCH] qt48: fix evaluation error on Darwin

---
 pkgs/development/libraries/qt-4.x/4.8/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/qt-4.x/4.8/default.nix b/pkgs/development/libraries/qt-4.x/4.8/default.nix
index 07a7993a67f..788fb874140 100644
--- a/pkgs/development/libraries/qt-4.x/4.8/default.nix
+++ b/pkgs/development/libraries/qt-4.x/4.8/default.nix
@@ -53,7 +53,7 @@ stdenv.mkDerivation rec {
       ./libressl.patch
       (substituteAll {
         src = ./dlopen-absolute-paths.diff;
-        cups = cups.out;
+        cups = if cups != null then cups.out else null;
         icu = icu.out;
         libXfixes = libXfixes.out;
         glibc = stdenv.cc.libc.out;