From b39a6ef532ed8739218e045b4fcf51a047b3c2a2 Mon Sep 17 00:00:00 2001
From: Jonas Hoersch <coroa@online.de>
Date: Tue, 11 Jun 2013 01:07:06 +0200
Subject: [PATCH] ppp: enable ipv6 support

networkmanager requires pppd to have ipv6 support for managing mobile
connections since version 0.9.5.95, ref. to commit 7575f4d.
---
 pkgs/tools/networking/ppp/default.nix | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/pkgs/tools/networking/ppp/default.nix b/pkgs/tools/networking/ppp/default.nix
index 2ca22fb1da7..6f6f2a0da55 100644
--- a/pkgs/tools/networking/ppp/default.nix
+++ b/pkgs/tools/networking/ppp/default.nix
@@ -18,7 +18,12 @@ stdenv.mkDerivation rec {
       ./nonpriv.patch
     ];
 
-  postPatch = "rm -v include/linux/if_pppol2tp.h";
+  postPatch = ''
+    # enable ipv6
+    substituteInPlace pppd/Makefile.linux \
+      --replace "#HAVE_INET6=y" "HAVE_INET6=y"
+    rm -v include/linux/if_pppol2tp.h
+  '';
 
   buildInputs = [ libpcap ];