previous versions of xmobar used to compile fine with GHC 6.10.4, but
the new version no longer does:

   src/Parsers.hs:163:52:
       Couldn't match expected type `Char' against inferred type `[Char]'
         Expected type: GenParser Char st Char
         Inferred type: GenParser Char st String
       In the second argument of `($)', namely `wrapSkip $ string "Run"'
       In a stmt of a 'do' expression:
             notFollowedBy $ wrapSkip $ string "Run"