diff --git a/air-extra.cabal b/air-extra.cabal
--- a/air-extra.cabal
+++ b/air-extra.cabal
@@ -1,17 +1,15 @@
 Name:                 air-extra
-Version:              2013.9.15
+Version:              2015.5.4
 Build-type:           Simple
 Synopsis:             air-extra
 Description:          An alternative Haskell Prelude library, extra helpers
 License:              BSD3
 Author:               Jinjing Wang
 Maintainer:           Jinjing Wang <nfjinjing@gmail.com>
-Build-Depends:        base
 Cabal-version:        >= 1.2
 category:             Development
 license-file:         LICENSE
 homepage:             https://github.com/nfjinjing/air-extra
-data-files:           readme.md, changelog.md, known-issues.md
 tested-with:          GHC==7.6.1
 
 library
@@ -21,13 +19,13 @@
                 , containers
                 , array
                 , parallel
-                , old-time
+                -- , old-time
                 , time
                 , bytestring >= 0.9
                 , regexpr >= 0.3.4
                 , parsec >= 2
                 , directory
-                , old-locale
+                -- , old-locale
                 , filepath
                 , air >= 2013.7.18
                 , text
diff --git a/changelog.md b/changelog.md
deleted file mode 100644
--- a/changelog.md
+++ /dev/null
@@ -1,5 +0,0 @@
-2011.6.11
----------
-
-* init
-
diff --git a/known-issues.md b/known-issues.md
deleted file mode 100644
--- a/known-issues.md
+++ /dev/null
diff --git a/readme.md b/readme.md
deleted file mode 100644
--- a/readme.md
+++ /dev/null
@@ -1,2 +0,0 @@
-An alternative Haskell Prelude library, extra helpers.
-
diff --git a/src/Air/Extra.hs b/src/Air/Extra.hs
--- a/src/Air/Extra.hs
+++ b/src/Air/Extra.hs
@@ -11,7 +11,7 @@
 import Prelude hiding ((.), (^), (>), (<), (/), elem, foldl, (-))
 import System.Directory
 import System.IO
-import System.Locale (defaultTimeLocale)
+-- import System.Locale (defaultTimeLocale)
 import Text.RegexPR
 
 import qualified Data.List as L
@@ -189,5 +189,3 @@
 line_buffer = do
   hSetBuffering stdout LineBuffering
   hSetBuffering stderr LineBuffering
-
-
