GHC 6.4 for a Debian distro

[Iavor Diatchki]

Hello,
I would like to install the following tools on a Debian Linux
distribution (testing flavor):
GHC 6.4, alex, happy, darcs
(I use Hugs from CVS, so I don't want to install the Debian version)
I would also like to be able to update/remove any one of these tools
independently (I know enough about the tools to know that they do not
need each other to work).

Can I achieve this by using debian packages?  I can get darcs, happy,
and alex to work, but the only GHC 6.4 package I could find (in
unstable) conflicts with the others.  It also seems to depend on Hugs
for some reason.  I was able to get a working GHC 6.4 by using "alien"
on the Fedora RPMs, but this seems like a rather embarassing (for the
Debian distro) solution.  Am I doing something wrong here?
-Iavor