From c8d3b166f57710e22caada90c31cf5e8df50a2d1 Mon Sep 17 00:00:00 2001
From: obadz <obadz-git@obadz.com>
Date: Mon, 20 Jun 2016 20:56:27 +0100
Subject: [PATCH] network-manager/l2tp: add workaround for
 https://github.com/xelerance/xl2tpd/issues/108

---
 pkgs/tools/networking/network-manager/l2tp.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/tools/networking/network-manager/l2tp.nix b/pkgs/tools/networking/network-manager/l2tp.nix
index f415b4f3bed..3b06bf4524a 100644
--- a/pkgs/tools/networking/network-manager/l2tp.nix
+++ b/pkgs/tools/networking/network-manager/l2tp.nix
@@ -33,6 +33,11 @@ stdenv.mkDerivation rec {
       })
     ];
 
+  # Workaround https://github.com/xelerance/xl2tpd/issues/108
+  postPatch = ''
+    substituteInPlace ./src/nm-l2tp-service.c --replace 'write_config_option (pppopt_fd, "lock\n");' ""
+  '';
+
   meta = with stdenv.lib; {
     description = "L2TP plugin for NetworkManager";
     inherit (networkmanager.meta) platforms;