diff --git a/System/EasyFile/Directory.hs b/System/EasyFile/Directory.hs
--- a/System/EasyFile/Directory.hs
+++ b/System/EasyFile/Directory.hs
@@ -34,8 +34,10 @@
   , copyPermissions
   )
 
+#if !MIN_VERSION_base(4,8,0)
 import Control.Applicative
-import qualified Control.Exception as E 
+#endif
+import qualified Control.Exception as E
 import System.Environment
 
 ----------------------------------------------------------------
@@ -97,7 +99,7 @@
 -}
 
 getHomeDirectory2 :: IO (Maybe FilePath)
-getHomeDirectory2 = (Just . fixPath <$> getEnv "HOME") `E.catch` 
+getHomeDirectory2 = (Just . fixPath <$> getEnv "HOME") `E.catch`
                     \(_ :: E.IOException) -> return Nothing
 
 {- | Returns the pathname of a directory in which application-specific
diff --git a/System/EasyFile/Missing.hs b/System/EasyFile/Missing.hs
--- a/System/EasyFile/Missing.hs
+++ b/System/EasyFile/Missing.hs
@@ -4,7 +4,9 @@
 
 ----------------------------------------------------------------
 
+#if !MIN_VERSION_base(4,8,0)
 import Control.Applicative
+#endif
 import Data.Time
 import Data.Time.Clock.POSIX
 import Data.Word (Word64)
diff --git a/easy-file.cabal b/easy-file.cabal
--- a/easy-file.cabal
+++ b/easy-file.cabal
@@ -1,5 +1,6 @@
+Cabal-Version:          >= 1.10
 Name:                   easy-file
-Version:                0.2.2
+Version:                0.2.3
 Author:                 Kazu Yamamoto <kazu@iij.ad.jp>
 Maintainer:             Kazu Yamamoto <kazu@iij.ad.jp>
 License:                BSD3
@@ -8,21 +9,58 @@
 Description:            Cross-platform File handling for Unix\/Mac\/Windows
 Homepage:               http://github.com/kazu-yamamoto/easy-file
 Category:               System
-Cabal-Version:          >= 1.6
 Build-Type:             Simple
 
+Tested-With:
+  GHC == 9.6.0
+  GHC == 9.4.4
+  GHC == 9.2.7
+  GHC == 9.0.2
+  GHC == 8.10.7
+  GHC == 8.8.4
+  GHC == 8.6.5
+  GHC == 8.4.4
+  GHC == 8.2.2
+  GHC == 8.0.2
+  GHC == 7.10.3
+  GHC == 7.8.4
+  GHC == 7.6.3
+  GHC == 7.4.2
+  GHC == 7.0.4
+
 Library
-  GHC-Options:          -Wall
   Exposed-Modules:      System.EasyFile
   Other-Modules:        System.EasyFile.FilePath
                         System.EasyFile.Directory
                         System.EasyFile.Missing
-  Build-Depends:        base >= 4 && < 5
+  Build-Depends:
+      base >= 4 && < 5
+    , directory
+    , filepath
+    , time
+
   if os(windows)
-    Build-Depends:      Win32, time, directory, filepath
+    Build-Depends:      Win32
   else
-    Build-Depends:      unix, time, directory, filepath
+    Build-Depends:      unix
 
+  Default-Language:     Haskell2010
+  GHC-Options:          -Wall
+  if impl(ghc >= 8)
+    GHC-Options:        -Wcompat
+
+
+Test-Suite test
+  Type:                 exitcode-stdio-1.0
+  Hs-Source-Dirs:       test
+  Main-Is:              Test.hs
+  Build-Depends:
+      base
+    , easy-file
+    , tasty
+    , tasty-hunit
+  Default-Language:     Haskell2010
+
 Source-Repository head
   Type:                 git
-  Location:             git://github.com/kazu-yamamoto/easy-file.git
+  Location:             https://github.com/kazu-yamamoto/easy-file.git
diff --git a/test/Test.hs b/test/Test.hs
new file mode 100644
--- /dev/null
+++ b/test/Test.hs
@@ -0,0 +1,31 @@
+{-# LANGUAGE CPP #-}
+
+module Main where
+
+import System.EasyFile
+import Test.Tasty
+import Test.Tasty.HUnit
+
+main :: IO ()
+main = defaultMain $
+  testCase "easy-file tests" $ do
+
+    assertEqual "Test that '/' is path separator"
+        ("foo" </> "bar")
+        "foo/bar"
+
+    isRelative "foo" @?= True
+
+    isRelative "/foo" @?= isWindows
+
+    isRelative "c:foo" @?= True
+
+    isRelative "c:/foo" @?= not isWindows
+
+isWindows :: Bool
+isWindows =
+#if defined(mingw32_HOST_OS) || defined(__MINGW32__)
+    True
+#else
+    False
+#endif