Haddock no longer needs alex or happy to build.

https://github.com/NixOS/nixpkgs/issues/2481
hackage4nix.hs: ignore agda stdlib
hackage4nix.hs: don't re-generate syb-0.4.1
Configure post-process hook for HTTP library.
Configure post-process hook for QuickCheck.
Configure post-process hook for tar.
Enable test builds with GHC 6.10.4.
Configure post-process hook for syb.
Configure post-process hook for GlomeVec.
Configure post-process hook and name mappings for bindings-GLFW.
Update post-processing hook for highlighting-kate.
hackage4nix.hs: pass on jhc, which is not registered on Hackage
Pass 'with_mpd' flag to xmobar builds.
Enable all extensions in xmobar by default.

https://github.com/NixOS/nixpkgs/pull/2728
Configure post-process hook for 'split'.
Configure post-processing hook for transformers 0.4.1 or later.
Update post-process hook for syb 0.4.2
Configure post-process hook for MFlow.
cabal2nix.cabal: tentatively bump version for next release
hackage4nix.hs: don't try to update the hoogle-local expression from John