ghci can't find Paths_ module created by cabal

[Robin Green]

I'm trying to run cabal-install in ghci so I can run it under the ghci
debugger. However I try it, though, I always get one of these two
errors:

/src/greenrd/darcs/cabal-install/Main.hs:70:17:
    Could not find module `Paths_cabal_install':
      Use -v to see a list of the files searched for.
Failed, modules loaded: none.

or

<command line>:
    Could not find module `Main':
      Use -v to see a list of the files searched for.

-- 
Robin