Updated Haskell packages.

- fgl-visualize: added meta.maintainers
 - gtk2hs-buildtools: added version 0.12.3
 - network-conduit: added version 0.4.0
 - path-pieces: updated to version 0.1.1
 - void: added version 0.5.5

svn path=/nixpkgs/trunk/; revision=33551

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

@@ -0,0 +1,15 @@
+{ cabal, semigroups }:
+
+cabal.mkDerivation (self: {
+  pname = "void";
+  version = "0.5.5";
+  sha256 = "011ji37d5f6xrvd6sq0zkzggaq11r7nyb2z5v3ix3kn14r5psfz3";
+  buildDepends = [ semigroups ];
+  meta = {
+    homepage = "http://github.com/ekmett/void";
+    description = "A Haskell 98 logically uninhabited data type";
+    license = self.stdenv.lib.licenses.bsd3;
+    platforms = self.ghc.meta.platforms;
+    maintainers = [ self.stdenv.lib.maintainers.andres ];
+  };
+})