Running the Cabal tests

[Erik de Castro Lopo]

Hi all,

I hacked together what I thought was a neat little feature (a 3 line diff)
and thought I'd add a test. Thats when I figured out I couldn't even run
the tests.

Reading `Cabal/tests/Readme.md` I see I need to set the environment var:

> * `CABAL_PACKAGETESTS_GHC` is the path to the GHC you compiled Cabal with
> * `CABAL_PACKAGETESTS_GHC_PKG` is the path to the ghc-pkg associated with this GHC
> * `CABAL_PACKAGETESTS_HADDOCK` is the path to the haddock associated with this GHC
> * `CABAL_PACKAGETESTS_GHC_VERSION` is the version of your GHC
> * `CABAL_PACKAGETESTS_DB_STACK` is a PATH-style list of package database paths,

The first four are obvious and easy, but I have no idea how to set the last
one.

Clues?

Erik
-- 
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Erik de Castro Lopo
http://www.mega-nerd.com/