{
  description = "NixOS system configuration";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    agenix.url = "github:ryantm/agenix";

    emacs-overlay = {
      url = "github:nix-community/emacs-overlay";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    nixpkgs-clisp.url = "github:NixOS/nixpkgs/da320e5472f021b96a883f71fc525ca0e4815273";
  };

  outputs = {
    self,
    nixpkgs,
    home-manager,
    agenix,
    emacs-overlay,
    nixpkgs-clisp,
  } @ inputs: let
    system = "x86_64-linux";
    baseModule = {lib, ...}: {
      imports = [
        home-manager.nixosModules.default
        agenix.nixosModules.default
      ];

      system.configurationRevision = lib.mkIf (self ? rev) self.rev;

      nixpkgs.overlays = [
        emacs-overlay.overlay
        (final: _prev: {
          clisp = nixpkgs-clisp.legacyPackages.${system}.clisp;
        })
      ];

      environment.systemPackages = [
        agenix.packages.${system}.default
      ];
    };
  in {
    nixosConfigurations.thonkpad = nixpkgs.lib.nixosSystem {
      modules = [
        baseModule
        ./hosts/thonkpad/configuration.nix
      ];
    };

    nixosConfigurations.server = nixpkgs.lib.nixosSystem {
      modules = [
        baseModule
        ./hosts/server/configuration.nix
      ];
    };

    nixosConfigurations.server-gpu = nixpkgs.lib.nixosSystem {
      modules = [
        baseModule
        ./hosts/server-gpu/configuration.nix
      ];
    };

    nixosConfigurations.rq = nixpkgs.lib.nixosSystem {
      modules = [
        baseModule
        ./hosts/rq/configuration.nix
      ];
    };

    nixosConfigurations.yoga = nixpkgs.lib.nixosSystem {
      modules = [
        baseModule
        ./hosts/yoga/configuration.nix
      ];
    };
  };
}