runhaskell and binary packages

FYI: Recently the problem how to package runhaskell correctly into an RPM
came up, but we didn't find a solution, so the GHC 6.4 RPMs on haskell.org
simply contain /usr/bin/runhaskell. This is obviously not good, as there
could be a Hugs on the system, too, GHC could be uninstalled while there is
still Hugs, the admin could have different preferences, etc.

Having looked around a bit, I think that the update-alternatives script
from Debian (shipped with SuSE, too) is the right way to go, but I still
have to read a bit of documentation and play around with the .spec files.
When this is done, I think the GHC 6.4 RPMs on haskell.org should be
re-packaged.

Currently I use SuSE Linux exclusively as my *nix platform, so I don't have
a clue how to handle this correctly on *BSD, gentoo, MacOS X, etc. One
important question is how RedHat/Fedora handles this: If it is done differently,
we will have to provide separate RPMs... :-P * * *

Cheers,
    S.