[Haskell-beginners] multi-haskell management

[Rustom Mody]

Ive just finished building haskell from source.
[Thanks to all the folks who've made this so easy]

1. What is the official way for ensuring that some command like
$ cabal install vector
goes into my new haskell and not the old?

2. If I modify PATH so that the new ghc is found before the system one,
will not system-ly things break (when for example I mess around in the
haskell sources and break it?)

[BTW I am on debian testing/gnome and I gather that an increasing amt of
sysad stuff is being done in haskell. So I certainly do not want that I
play around inside haskell sources and synaptic for example stops working
:-) ]
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