[Haskell-cafe] Build failed - hidden package ?

[Dunric]

Hi.
I've got stuck with the following compilation error I probably can't fully understand:

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Building library...
...
Using package config file: /usr/local/lib/ghc-6.6/package.conf
wired-in package base mapped to base-2.0
wired-in package rts mapped to rts-1.0
wired-in package haskell98 mapped to haskell98-1.0
wired-in package template-haskell mapped to template-haskell-2.0
Hsc static flags: -static
...
Graphics/UI/SDL/Rotozoomer.hs:15:7:
    Could not find module `Foreign.C':
      it is a member of package base, which is hidden

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What does such error mean ?

Modules Foreign and Foreign.C are installed and available from the default path.
Lines 12-15 of Rotozoomer.hs:
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module Graphics.UI.SDL.Rotozoomer where

import Foreign
import Foreign.C
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Any idea what's wrong, resp. some explanation why compilation fails ?

Thanks in an advance.

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