Regenerated all Haskell packages with the latest version of cabal2nix.

svn path=/nixpkgs/trunk/; revision=32292

pkgs/development/libraries/haskell/directory-tree/default.nix

@@ -1,9 +1,10 @@
-{ cabal }:
+{ cabal, Cabal, filepath }:
 
 cabal.mkDerivation (self: {
   pname = "directory-tree";
   version = "0.10.0";
   sha256 = "08b0w9j55x6c06pri7yvv84n24inhpb4miybdnkyjkjy7r3yy7m4";
+  buildDepends = [ Cabal filepath ];
   meta = {
     homepage = "http://coder.bsimmons.name/blog/2009/05/directory-tree-module-released/";
     description = "A simple directory-like tree datatype, with useful IO functions";