Added complete yesod.

Some downgrades were necessary.

svn path=/nixpkgs/trunk/; revision=28364

pkgs/development/libraries/haskell/zlib-enum/default.nix

@@ -0,0 +1,15 @@
+{cabal, enumerator, transformers, zlibBindings} :
+
+cabal.mkDerivation (self : {
+  pname = "zlib-enum";
+  version = "0.2.1";
+  sha256 = "0cnx7sbgj6s0gvq6pcqyi3xahx7x3bj47ap10z89qfbk0906rkq8";
+  propagatedBuildInputs = [ enumerator transformers zlibBindings ];
+  meta = {
+    homepage = "http://github.com/maltem/zlib-enum";
+    description = "Enumerator interface for zlib compression";
+    license = self.stdenv.lib.licenses.mit;
+    platforms = self.stdenv.lib.platforms.haskellPlatforms;
+    maintainers = [ self.stdenv.lib.maintainers.andres ];
+  };
+})