GHC 7.8 compatibility:

* Explicitly import pure, (<$>), (<*>) and (<$) from Control.Applicative.
 * Use DeriveDataTypeable pragma.
 * Remove type signature from pattern synonym.

XMonad/Layout/NoBorders.hs

@@ -1,5 +1,5 @@
-{-# LANGUAGE FlexibleContexts, FlexibleInstances, MultiParamTypeClasses, TypeSynonymInstances #-}
-{-# LANGUAGE PatternGuards #-}
+{-# LANGUAGE FlexibleContexts, FlexibleInstances, MultiParamTypeClasses #-}
+{-# LANGUAGE TypeSynonymInstances, PatternGuards, DeriveDataTypeable #-}
 
 -----------------------------------------------------------------------------
 -- |
@@ -42,6 +42,7 @@ import           Data.List
 import           Data.Monoid
 import qualified Data.Map                       as M
 import           Data.Function                  (on)
+import           Control.Applicative            ((<$>),(<*>),pure)
 import           Control.Monad                  (guard)