{
  description = "Alex's super mega awesome nixos config";

  # A flake's inputs specify the dependencies that get pulled in. Each input is pinned to a specific version (the git commit) of that dependency.
  inputs = {
    nixpkgs.url = github:NixOS/nixpkgs/nixos-unstable;

    home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nixpkgs"; # This flake also takes in nixpkgs as its own input, so we can override it here to ensure the same pkgs are used!
    };

    firefox-addons = {
      url = "gitlab:rycee/nur-expressions?dir=pkgs/firefox-addons";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    atau-nixpkgs = {
      url = "git+https://git.atauno.com/atau/atau-nixpkgs?ref=main&rev=1e72f4b1e9b7a2991e3ccdebbe75d312f016da3b";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nixpkgs, home-manager, firefox-addons, ... }@inputs:
    let
      hmModule = system: (
        home-manager.nixosModules.home-manager {
          home-manager.useGlobalPkgs = true;
          home-manager.useUserPackages = true;
          home-manager.backupFileExtension = "backup";
          home-manager.users.alex = import ./config/users/alex;
          home-manager.extraSpecialArgs = { ff = firefox-addons.packages.${system}; };
        }
      );
    in
    {
      nixosConfigurations = {
        ## ---- personal computers (linux) ----
        nixos76 = nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          modules = [
            ./config/systems/nixos76
            home-manager.nixosModules.home-manager
            {
              home-manager.useGlobalPkgs = true;
              home-manager.useUserPackages = true;
              home-manager.backupFileExtension = "backup";
              home-manager.users.alex = import ./config/users/alex;
              # Optionally, use home-manager.extraSpecialArgs to pass
              # arguments to home.nix
            }
          ];
        };
        thelio76 = nixpkgs.lib.nixosSystem rec {
          system = "x86_64-linux";
          modules = [
            ./config/systems/thelio76
            (import ./config/modules/home-manager.nix {
              inherit system inputs;
            })
            # home-manager.nixosModules.home-manager
            # {
            #   home-manager.useGlobalPkgs = true;
            #   home-manager.useUserPackages = true;
            #   home-manager.backupFileExtension = "backup";
            #   home-manager.users.alex = import ./config/users/alex;
            #   home-manager.extraSpecialArgs = { ff = firefox-addons.packages.${system}; };
            # }
          ];
        };

        ## ---- servers ----
        ursa-minor = nixpkgs.lib.nixosSystem {
          system = "aarch64-linux";
          modules = [
            ./ursa-minor/configuration.nix
          ];
        };
        ursa-major = nixpkgs.lib.nixosSystem {
          system = "aarch64-linux";
          modules = [
            ./ursa-major/configuration.nix
          ];
        };
        atauno = nixpkgs.lib.nixosSystem {
          system = "aarch64-linux";
          modules = [
            ./atauno/configuration.nix
          ];
        };
      };
    };
}