$ ghc --make xmonad.hs -dynamic -fPIC -i -ilib -fforce-recomp -main-is main -v0 -outputdir /home/berkeley/.xmonad/build-x86_64-linux -o /home/berkeley/.xmonad/xmonad-x86_64-linux

xmonad.hs:69:1: warning: [-Wtabs]
    Tab character found here, and in two further locations.
    Please use spaces instead.
   |
69 |           spawnOnce "xrdb /home/berkeley/.Xresources"
   | ^^^^^^^^