overlay.nix

self: super:
let head-hackage-overrides =
  self: sup: import ./head-hackage/patches.nix { pkgs = super; } self sup;
in

{
  simple-server = super.callPackage ./simple-serve/server.nix {};
  ghcHEAD = super.haskell.packages.ghcHEAD.override
  { overrides = sel: sup:
                  ((head-hackage-overrides sel sup)
                  // { mkDerivation = sup.mkDerivation.override { doJailbreak = true; }; }
                  ); };
}