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diff --git a/System/IO/Unsafe.hs b/System/IO/Unsafe.hs
index 2f98633..1ec5361 100644
--- a/System/IO/Unsafe.hs
+++ b/System/IO/Unsafe.hs
@@ -1,26 +1,37 @@
+{-# OPTIONS_GHC -fno-implicit-prelude #-}
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  System.IO.Unsafe
 -- Copyright   :  (c) The University of Glasgow 2001
--- License     :  BSD-style (see the file libraries/core/LICENSE)
+-- License     :  BSD-style (see the file libraries/base/LICENSE)
 -- 
 -- Maintainer  :  libraries@haskell.org
 -- Stability   :  provisional
 -- Portability :  portable
 --
--- $Id: Unsafe.hs,v 1.2 2002/04/24 16:31:45 simonmar Exp $
---
--- "Unsafe" IO operations.
+-- \"Unsafe\" IO operations.
 --
 -----------------------------------------------------------------------------
 
 module System.IO.Unsafe (
+   -- * Unsafe 'System.IO.IO' operations
    unsafePerformIO,	-- :: IO a -> a
    unsafeInterleaveIO,	-- :: IO a -> IO a
   ) where
 
-import Prelude
-
 #ifdef __GLASGOW_HASKELL__
-import GHC.IOBase
+import GHC.IOBase (unsafePerformIO, unsafeInterleaveIO)
+#endif
+
+#ifdef __HUGS__
+import Hugs.IOExts (unsafePerformIO, unsafeInterleaveIO)
+#endif
+
+#ifdef __NHC__
+import NHC.Internal (unsafePerformIO)
+#endif
+
+#if !__GLASGOW_HASKELL__ && !__HUGS__
+unsafeInterleaveIO :: IO a -> IO a
+unsafeInterleaveIO f = return (unsafePerformIO f)
 #endif