Hi, First, let me congratulate all the xmonad* team for such a cool window manager. Second, this is my problem. I'd like to use several of the XmonadContrib modules but it fails at compiling with this message: Building xmonad-0.2... [ 3 of 14] Compiling XMonadContrib.LayoutHelpers ( XMonadContrib/LayoutHelpers.hs, dist/build/xmonad/xmonad-tmp/XMonadContrib/LayoutHelpers.o ) XMonadContrib/LayoutHelpers.hs:25:25: Module `StackSet' does not export `integrate' I am not a Haskell developper at all (my toy is lisp and only lisp) so I can't fix that by myself. Do you have a clue for me ? Extra bonus question: do you think I can make my own window manager by following your principles (QuickCheck and such). I am currently collaborating to a Common Lisp project but we did not take time to "think" about this and I fear our project is hard to maintain as is. Thank you very much.