[xmonad] Xmobar tab completion

Hello, I have been using xmonad for a few weeks. After updating via aptitude on Debian unstable a few days ago, xmobarno longer offers tab-completions. It still works, but I have to ype out the whole command name. The colour of the bar is now black as well. I found some discussion of this on a forum. A solution was to rebuild xmonad. Not knowing Haskell, I'm not sure how to do this. Is there another solution? If not, how do I rebuild xmonad - is this even possible with the Debian package, or do I need to install from source? Thanks, Tyler