diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 Usage
 -----
 
-Cgrep 6.6.11. Usage: cgrep [OPTION] [PATTERN] files...
+Cgrep 6.6.13. Usage: cgrep [OPTION] [PATTERN] files...
 
 cgrep [OPTIONS] [ITEM]
 
diff --git a/cgrep.cabal b/cgrep.cabal
--- a/cgrep.cabal
+++ b/cgrep.cabal
@@ -1,6 +1,6 @@
 Name:                cgrep
 Description:         Cgrep: a context-aware grep for source codes
-Version:             6.6.12
+Version:             6.6.13
 Synopsis:            Command line tool
 Homepage:            http://awgn.github.io/cgrep/
 License:             GPL-2
diff --git a/src/CGrep/Output.hs b/src/CGrep/Output.hs
--- a/src/CGrep/Output.hs
+++ b/src/CGrep/Output.hs
@@ -15,6 +15,8 @@
 -- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 --
 
+{-# LANGUAGE CPP #-}
+
 module CGrep.Output (Output(..),
                      mkOutput,
                      putPrettyHeader,
@@ -33,6 +35,10 @@
 
 import Control.Monad.Trans.Reader
 import Control.Monad.IO.Class
+
+#if __GLASGOW_HASKELL__ < 710
+import Control.Applicative
+#endif
 
 import Data.Maybe
 import Data.List