default.nix

{ compiler ? "ghc865",
  ghcjs ? "ghcjs"
}:
  let nixpkgs = import (builtins.fetchTarball {
        name = "nixpkgs-20.03-2020-06-28";
        url = "https://github.com/NixOS/nixpkgs/archive/f8248ab6d9e69ea9c07950d73d48807ec595e923.zip";
        sha256 = "009i9j6mbq6i481088jllblgdnci105b2q4mscprdawg3knlyahk";
      }) {
        overlays = [
          import ./client.nix { inherit ghcjs; }
          #import ./server.nix { inherit ghcjs compiler; }
        ];
      };
  in {
    client = nixpkgs.haskell.${ghcjs}.Carnap-GHCJS;
    #server = nixpkgs.haskell.${ghcjs}.Carnap-Server;
  }