The 'random' library is no longer a core library in GHC 7.2.1. For older

versions of the compiler, haskell-packages.nix provides a null attribute.

svn path=/nixpkgs/trunk/; revision=28500

pkgs/applications/window-managers/xmonad/xmonad-contrib.nix

@@ -1,4 +1,5 @@
-{ cabal, X11, X11Xft, extensibleExceptions, mtl, utf8String, xmonad
+{ cabal, X11, X11Xft, extensibleExceptions, mtl, random, utf8String
+, xmonad
 }:
 
 cabal.mkDerivation (self: {
@@ -6,7 +7,7 @@ cabal.mkDerivation (self: {
   version = "0.9.2";
   sha256 = "06hg5j4w8iz62wmyygq4c7xcbi9dxlhhh3dbic438cjk7c0w1h5p";
   buildDepends = [
-    X11 X11Xft extensibleExceptions mtl utf8String xmonad
+    X11 X11Xft extensibleExceptions mtl random utf8String xmonad
   ];
   meta = {
     homepage = "http://xmonad.org/";