making GHC from source

[Serge D. Mechveliani]

People,

I need to install ghc-6.8.2 from source.
As I recall, this needs  Happy and Alex. Right?
Among Happy versions, it is visible only a couple latest ones, and to install
any of them, one needs  Cabal.
Installing Cabal is as follows:   
  make install
  mkdir -p dist/tmp
  ghc --make -cpp -Wall -DCABAL_VERSION=1,2,3,0 -i. -odir dist/tmp 
                                           -hidir dist/tmp Setup.lhs -o setup
  make: ghc: command not found.

We have a `make' loop:    ghc --> Happy --> Cabal --> ghc

Old Happy was good: it did not require GHC -- as I recall. Do I mistake?
Now I have to install GHC from binary, and it will report of library version mismatch ...
and so on.
Do not you think that, generally, something is going wrong here?

Regards,

-----------------
Serge Mechveliani
mechvel at botik.ru
http://www.botik.ru/~mechvel