Data.Map in 6.8.1

[Serge D. Mechveliani]

Dear GHC developers and users,

I am trying to port the Dumatel-1.06 application from  ghc-6.6.1  to
ghc-6.8.0.20070928-src.

First, it does not find  runhaskell.
All right, I replace it with  runghc  in order to see what happens next.

Now,       make configure
reports

 runghc Setup.hs configure --ghc --prefix=/home/mechvel/dm/1.06/dm/source/inst
 Configuring dumatel-1.6...

In 6.6.1, the report of  runhaskell  looked better, it wrote on the 
screen about  ghc  found in such and such place, and so on. 
Where to see this new report in a more detail?

(is this a matter of the Cabal version?)

Further,  make build  
reports
-------------------------------------
runghc Setup.hs build
Preprocessing library dumatel-1.6...
Building dumatel-1.6...

Dumatel/Prelude5.hs:28:17:
    Could not find module `Data.Map':
      it is a member of package containers-0.1, which is hidden
------------------------------------

Should I change something in  dm.cabal ?
For example, it contains the line

  build-depends:   base, haskell98

Where are docs on  ghc-6.8.1 (in particular, release notes) ?

Thank you in advance for your explanations,

-----------------
Serge Mechveliani
mechvel at botik.ru