Hello,

I experienced some troubles at recompiling your example code. While i'm not an haskell programmer, i managed to fix it this way:

The error was:

Couldn't match expected type `D.ObjectPath'
            with actual type `[Char]'

So i forced the types:

D.objectPath_ "/org/xmonad/Log") (D.interfaceName_ "org.xmonad.Log") (D.memberName_ "Update")

Ubuntu precise (12.04) using some quantal packages (haskell-dbus)