Christian, I'm not sure about the other issues you mentioned but can
probably help with the following.
On Tue, Sep 23, 2008 at 6:38 AM, Christian Maeder
But finally installation succeeded (editline is missing and the arrow keys don't work).
This means that the editline package could not be built for some reason. Is this on your OS X machine? If so, it's strange because libedit should be installed on OS X by default; what OS version are you running? If you separately download and build the editline package from hackage, what errors do you get?
Why are there 2 base packages?
base-3.0.3 is a compatibility package which provides the same API as in ghc-6.8.*. The base-4 package has the new API (for example, extensible exceptions). -Judah