lib/yggdrasil: use yggdrasil from <nixpkgs-master>

hosts/pulsebert/configuration.nix

@@ -14,8 +14,8 @@ in {
       ../../lib/admins.nix
       ../../lib/hq.nix
       ../../lib/users.nix
-      . ./../lib/mpd.nix
-      #../../lib/yggdrasil.nix
+      ../../lib/mpd.nix
+      ../../lib/yggdrasil.nix
       ../../lib/hail.nix
     ];
 

lib/yggdrasil.nix

@@ -1,4 +1,7 @@
 { config, ... }: {
+  imports = [
+    <nixpkgs-master/nixos/modules/services/networking/yggdrasil.nix>
+  ];
 
   networking.firewall.extraCommands =
     "ip6tables -A INPUT -s fe80::/10 -j ACCEPT";