[Nix-dev] GHC Darwin binaries on Hydra are broken (was: Override package in local default.nix)

[Peter Simons]

Hi Alfredo,

 > 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...

you are working on Darwin, right? If that's the case, then you've run
into <https://github.com/NixOS/nixpkgs/issues/2689>.

Basically, Hydra serves broken GHC binaries on Darwin. The closure comes
with an ancient version of Haddock for reasons nobody quite understands.

Best regards,
Peter