gtkpod: fix build

pkgs/applications/audio/gtkpod/default.nix

@@ -1,6 +1,7 @@
-{ lib, stdenv, fetchurl, pkg-config, wrapGAppsHook, intltool, libgpod, curl, flac,
-  gnome, gtk3, gettext, perlPackages, flex, libid3tag, gdl,
-  libvorbis, gdk-pixbuf }:
+{ lib, stdenv, fetchurl, pkg-config, wrapGAppsHook, intltool, libgpod, libxml2, curl, flac
+, gnome, gtk3, gettext, perlPackages, flex, libid3tag, gdl
+, libvorbis, gdk-pixbuf
+}:
 
 stdenv.mkDerivation rec {
   version = "2.1.5";
@@ -14,7 +15,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkg-config wrapGAppsHook intltool ];
   buildInputs = [
     curl gettext
-    flex libgpod libid3tag flac libvorbis gtk3 gdk-pixbuf
+    flex libgpod libid3tag flac libvorbis libxml2 gtk3 gdk-pixbuf
     gdl gnome.adwaita-icon-theme gnome.anjuta
   ] ++ (with perlPackages; [ perl XMLParser ]);