rec {

  overlays = [

    # Make both buildGoModules use static compilation by default.
    (final: prev:

      let

        buildArgs = {
          doCheck = false;
          CGO_ENABLED=0;
          tags = [ "netgo" "timetzdata" ];
          ldflags = [ "-w" "-extldflags=-static" ];
        };

      in {

        go = prev.go_1_18;
        buildGoModule = args: prev.buildGoModule (buildArgs // args);
        buildGo118Module = args: prev.buildGo118Module (buildArgs // args);

      }
    )

    (final: prev: { rebase = prev.callPackage ./rebase.nix {}; })
    (final: prev: { yq-go = prev.callPackage ./yq-go.nix {}; })

    (final: prev: { nebula = prev.callPackage ./nebula.nix {
      buildGoModule = prev.buildGo118Module;
    }; })

  ];

  version = "22-05";
  rev = "2aec372cdcd4d73b94863611fea70e0884270fdc";

  src = fetchTarball {
    name = "nixpkgs-${version}";
    url = "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz";
    sha256 = "1pbfhlh4v8l70p44gspsci3i6w0wk70vaisiawg3jhka2nxb8367";
  };

  pkgs = import src { inherit overlays; };
}