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Can't find DPH

I added the following to the top of my module:

{-# LANGUAGE PArr, ParallelListComp #-}
{-# OPTIONS -fvectorise #-}

But when building I got:

GHC error in desugarer lookup in main:Board:
  Failed to load interface for `Data.Array.Parallel.Lifted.PArray':
    no package matching `dph-par' was found
ghc: panic! (the 'impossible' happened)
  (GHC version 6.11.20090317 for x86_64-unknown-linux):
	initDs IOEnv failure

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

I hadn't done anything in particular to try to install DPH, so this is probably a user error, but as the panic occurred, i felt duty-bound to report the bug as requested.

Edited by Simon Peyton Jones
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