From db3602b5d6a928a69cc00d837d513817bdabe1c4 Mon Sep 17 00:00:00 2001
From: "Jason \"Don\" O'Conal" <lovek323@gmail.com>
Date: Fri, 10 Jul 2015 10:18:29 +1000
Subject: [PATCH] gnupg: fix build on darwin

---
 pkgs/tools/security/gnupg/20.nix | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkgs/tools/security/gnupg/20.nix b/pkgs/tools/security/gnupg/20.nix
index 542baa95efe2..016b22916ead 100644
--- a/pkgs/tools/security/gnupg/20.nix
+++ b/pkgs/tools/security/gnupg/20.nix
@@ -21,7 +21,8 @@ stdenv.mkDerivation rec {
 
   buildInputs
     = [ readline zlib libgpgerror libgcrypt libassuan libksba pth
-        openldap bzip2 libusb curl libiconv ];
+        openldap bzip2 curl libiconv ]
+        ++ stdenv.lib.optional (!stdenv.isDarwin) libusb;
 
   patchPhase = ''
     find tests -type f | xargs sed -e 's@/bin/pwd@${coreutils}&@g' -i