diff -u xmonad-0.9.1/XMonad/Core.hs\~ xmonad-0.9.1/XMonad/Core.hs
--- xmonad-0.9.1/XMonad/Core.hs~	2009-12-17 09:25:04.000000000 +1000
+++ xmonad-0.9.1/XMonad/Core.hs	2010-09-12 16:39:48.553458230 +1000
@@ -420,7 +420,7 @@
         -- temporarily disable SIGCHLD ignoring:
         uninstallSignalHandlers
         status <- bracket (openFile err WriteMode) hClose $ \h -> do
-            waitForProcess =<< runProcess "ghc" ["--make", "xmonad.hs", "-i", "-ilib", "-fforce-recomp", "-v0", "-o",binn] (Just dir)
+            waitForProcess =<< runProcess "ghc" ["-dynamic", "--make", "xmonad.hs", "-i", "-ilib", "-fforce-recomp", "-v0", "-o",binn] (Just dir)
                                     Nothing Nothing Nothing (Just h)
 
         -- re-enable SIGCHLD: