xmonad.errors

xmonad.hs:155:7:
    Ambiguous occurrence `font'
    It could refer to either `XMonad.Prompt.font',
                             imported from XMonad.Prompt at xmonad.hs:26:1-20
                          or `Dzen.font',
                             imported from Dzen at xmonad.hs:35:1-11
                               (defined at lib/Dzen.hs:89:7)

xmonad.hs

-- snip

import XMonad.Prompt
import XMonad.Prompt.Shell

import Dzen -- from http://pbrisbin.com/xmonad/docs/src/Dzen.html

myAdditionalKeys =
    [ -- run anything
      ("M-S-x", shellPrompt defaultXPConfig)
       -- snip
    ]

-- dzen bars
myLeftBar :: DzenConf
myLeftBar = defaultDzen
    { width    = Just $ Percent 45
    , font     = Just "Droid Sans Mono-10" -- XXX This line is 155
    , fg_color = Just "grey"
    , bg_color = Just "black"
    , exec     = []
    }

myRightBar :: DzenConf
myRightBar = myLeftBar
    { alignment  = Just RightAlign
    , x_position = Just $ Percent 45
    , width      = Just $ Percent 55
    }