From c6b8312f21484f5948413ac4e80747cb41fa8c43 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20=C4=8Cun=C3=A1t?= <vcunat@gmail.com>
Date: Sun, 6 Jan 2019 14:26:03 +0100
Subject: [PATCH] bird2: fixup build after 7bb24a65e

I didn't look whether bird2 cross-compiles, but the patch wouldn't apply.
---
 pkgs/servers/bird/default.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkgs/servers/bird/default.nix b/pkgs/servers/bird/default.nix
index 94579e1bdb1..7e0bf298b02 100644
--- a/pkgs/servers/bird/default.nix
+++ b/pkgs/servers/bird/default.nix
@@ -18,12 +18,14 @@ let
 
       patches = [
         (./. + "/dont-create-sysconfdir-${builtins.substring 0 1 version}.patch")
+      ]
+      ++ optional (lib.versionOlder version "2")
         # https://github.com/BIRD/bird/pull/4
         (fetchpatch {
           url = "https://github.com/BIRD/bird/commit/fca9ab48e3823c734886f47156a92f6b804c16e9.patch";
           sha256 = "1pnndc3n56lqqcy74ln0w5kn3i9rbzsm2dqiyp1qw7j33dpkln1b";
         })
-      ];
+        ;
 
       CPP="${stdenv.cc.targetPrefix}cpp -E";