[Nix-dev] Override package in local default.nix

[Alfredo Di Napoli]

Hello guys,

I'm trying to get a clean nix-shell for haskell's ghc783.
I have tried my usual "blueprints", but it's failing with:

Running Haddock for hscolour-1.20.3...
Preprocessing library hscolour-1.20.3...
haddock: unrecognized option `--package=hscolour-1.20.3'
unrecognized option `--verbose'
Usage: haddock [OPTION...] file...

I have found a log on an IRC conversation on internet which suggest do add
hyperlinkSource = false in my project file. Not having any idea of how to
 do that, I've
tried to override the cabal package to override that flag. My attempt is
this:

https://gist.github.com/adinapoli/67b2689c460d24bd1667

Even though this compiles fine, it seems to be completely ignored by
nix-shell, and
running "nix-shell --pure" doesn't change the final outcome.

What I'm doing wrong?
Thanks!
Alfredo
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