{
  description = "tsnet-proxy: proxy onto tsnet";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    gomod2nix.url = "github:nix-community/gomod2nix";
    gomod2nix.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = { self, nixpkgs, gomod2nix, systems }: let
    eachSystem = f: nixpkgs.lib.genAttrs (import systems) (system: f rec {
      inherit system;
      pkgs = nixpkgs.legacyPackages.${system};
      goModPkgs = gomod2nix.legacyPackages.${system};
      inherit (pkgs) callPackage;
    });
  in {
    packages = eachSystem ({ goModPkgs, callPackage, ...}: {
      default = callPackage ./. {
        inherit (goModPkgs) buildGoApplication;
      };
    });
    devShells = eachSystem ({goModPkgs, callPackage, ...}: {
      default = callPackage ./shell.nix {
        inherit (goModPkgs) mkGoEnv gomod2nix;
      };
    });
  };
}