Regenerated all Haskell packages with the latest version of cabal2nix.

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

pkgs/development/libraries/haskell/dotgen/default.nix

@@ -1,4 +1,4 @@
-{ cabal }:
+{ cabal, Cabal }:
 
 cabal.mkDerivation (self: {
   pname = "dotgen";
@@ -6,6 +6,7 @@ cabal.mkDerivation (self: {
   sha256 = "1g5ds0mqkz0lzhcp42hin08azschs3p083ikdk4d5jil8rzl7d8k";
   isLibrary = true;
   isExecutable = true;
+  buildDepends = [ Cabal ];
   meta = {
     description = "A simple interface for building .dot graph files.";
     license = self.stdenv.lib.licenses.bsd3;