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diff --git a/libraries/base/Control/Parallel.hs b/libraries/base/Control/Parallel.hs
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+-----------------------------------------------------------------------------
+-- 
+-- Module      :  Control.Parallel
+-- Copyright   :  (c) The University of Glasgow 2001
+-- License     :  BSD-style (see the file libraries/core/LICENSE)
+-- 
+-- Maintainer  :  libraries@haskell.org
+-- Stability   :  experimental
+-- Portability :  non-portable
+--
+-- $Id: Parallel.hs,v 1.1 2001/06/28 14:15:01 simonmar Exp $
+--
+-- Parallel Constructs
+--
+-----------------------------------------------------------------------------
+
+module Control.Parallel (
+          par, seq -- re-exported
+#if defined(__GRANSIM__)
+	, parGlobal, parLocal, parAt, parAtAbs, parAtRel, parAtForNow     
+#endif
+    ) where
+
+import Prelude
+
+#ifdef __GLASGOW_HASKELL__
+import GHC.Conc	( par )
+#endif
+
+#if defined(__GRANSIM__)
+import PrelBase
+import PrelErr   ( parError )
+import PrelGHC   ( parGlobal#, parLocal#, parAt#, parAtAbs#, parAtRel#, parAtForNow# )
+
+{-# INLINE parGlobal #-}
+{-# INLINE parLocal #-}
+{-# INLINE parAt #-}
+{-# INLINE parAtAbs #-}
+{-# INLINE parAtRel #-}
+{-# INLINE parAtForNow #-}
+parGlobal   :: Int -> Int -> Int -> Int -> a -> b -> b
+parLocal    :: Int -> Int -> Int -> Int -> a -> b -> b
+parAt	    :: Int -> Int -> Int -> Int -> a -> b -> c -> c
+parAtAbs    :: Int -> Int -> Int -> Int -> Int -> a -> b -> b
+parAtRel    :: Int -> Int -> Int -> Int -> Int -> a -> b -> b
+parAtForNow :: Int -> Int -> Int -> Int -> a -> b -> c -> c
+
+parGlobal (I# w) (I# g) (I# s) (I# p) x y = case (parGlobal# x w g s p y) of { 0# -> parError; _ -> y }
+parLocal  (I# w) (I# g) (I# s) (I# p) x y = case (parLocal#  x w g s p y) of { 0# -> parError; _ -> y }
+
+parAt       (I# w) (I# g) (I# s) (I# p) v x y = case (parAt#       x v w g s p y) of { 0# -> parError; _ -> y }
+parAtAbs    (I# w) (I# g) (I# s) (I# p) (I# q) x y = case (parAtAbs#  x q w g s p y) of { 0# -> parError; _ -> y }
+parAtRel    (I# w) (I# g) (I# s) (I# p) (I# q) x y = case (parAtRel#  x q w g s p y) of { 0# -> parError; _ -> y }
+parAtForNow (I# w) (I# g) (I# s) (I# p) v x y = case (parAtForNow# x v w g s p y) of { 0# -> parError; _ -> y }
+
+#endif
+
+-- Maybe parIO and the like could be added here later.
+#ifndef __GLASGOW_HASKELL__
+-- For now, Hugs does not support par properly.
+par a b = b
+#endif