[Haskell] Haddock not being able to read interface file

Hello, I want to generate Haddock documentation for some Haskell files and want to create hyperlinks to the base package’s documentation. I’ve downloaded <http://www.haskell.org/ghc/docs/latest/html/libraries/base/base.haddock> and use the option --read-interface=http://www.haskell.org/ghc/docs/latest/html/libraries/base,base.haddock in my Haddock command line. However, Haddock outputs the following: haddock: Warning: The interface file "base.haddock" could not be read. Maybe it's from a later version of Haddock? This happens with Haddock 0.8 as well as the current development version of Haddock. What’s wrong here? Best wishes, Wolfgang