[Haskell-cafe] already installed packages alerted as not being installed

[Kazu Yamamoto ( 山本和彦 )]

Hello,

> thanks I wanted to mention that the "unknown symbol" error is very
> likely not related to the cab tool as the same error appears, when
> using the cabal - tool. I guess we can ignore it even in the context
> of my main question, sorry for being to verbose. What I found more
> interesting is, that cab doesn't try to re-install an installed
> package - already in the database too, as ghc-pkg output pretends -
> which is expected behaviour. The cabal system frontend obviously does
> trying to reinstall the package though. This seems like different
> model of reality...

This is not true.

cab install re-installs some packages if necessary, unfortunately.
That's why I recommend to use "cab install -n".

--Kazu