If directory < 1.2.3.0 then don't set modification times on copy

Make.hs

@@ -1,6 +1,6 @@
+{-# LANGUAGE CPP #-}
+
 -- | Main build script for RGL
--- There is no associated cabal file, but these dependencies are known:
--- * directory >= 1.2.3.0
 
 import Data.List (find,isPrefixOf,isSuffixOf,(\\),unfoldr)
 import Data.Maybe (catMaybes)
@@ -10,7 +10,10 @@ import System.Exit (ExitCode(..),exitFailure)
 import System.Environment (getArgs,lookupEnv)
 import System.Process (rawSystem)
 import System.FilePath ((</>)) -- ,takeFileName,addExtension,dropExtension)
-import System.Directory (createDirectoryIfMissing,copyFile,getModificationTime,setModificationTime,getDirectoryContents,removeDirectoryRecursive,findFile)
+import System.Directory (createDirectoryIfMissing,copyFile,getDirectoryContents,removeDirectoryRecursive,findFile)
+#if MIN_VERSION_directory(1,2,3)
+import System.Directory (getModificationTime,setModificationTime)
+#endif
 import Control.Monad (when,unless)
 
 main :: IO ()
@@ -78,7 +81,9 @@ copyAll msg from to = do
 copyFileWithModificationTime :: FilePath -> FilePath -> IO ()
 copyFileWithModificationTime source destination = do
   copyFile source destination
+#if MIN_VERSION_directory(1,2,3)
   getModificationTime source >>= setModificationTime destination
+#endif
 
 -- | Remove dist directory
 clean :: IO ()