{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
    nixbsd.url = "github:nixos-bsd/nixbsd/main";
  };
  outputs = { self, nixpkgs, nixbsd, ... }: {
    nixosConfigurations = let
      sitesFiles = builtins.readDir ./sites;
      sitesNames = builtins.filter (name: builtins.pathExists ./sites/${name}/configuration.nix) (builtins.attrNames sitesFiles);
      systemTypes = {
        nixos = nixpkgs.lib.nixosSystem;
        nixbsd = nixbsd.lib.nixbsdSystem;
      };
      systemName = name: builtins.replaceStrings ["\n"] [""] (builtins.readFile ./sites/${name}/system);
      configurations = builtins.listToAttrs (builtins.map (name: {inherit name; value = systemTypes.${systemName name} { modules = [ ./configuration.nix ./configuration-${systemName name}.nix ./sites/${name}/configuration.nix ]; }; }) sitesNames);
      in configurations;

    packages = let
      forBuildSystem = platform: let
        toBuildSystem = config: config.extendModules { modules = [ { nixpkgs.buildPlatform = "x86_64-linux"; } ]; };
        toToplevel = extended: {
          system = extended.config.system.build.toplevel;
        };
        toSystem = name: config: toToplevel (toBuildSystem config);
        configurations = builtins.mapAttrs toSystem self.nixosConfigurations;
      in configurations;
      buildPlatforms = [ "x86_64-linux" "aarch64-linux" "x86_64-freebsd" "aarch64-freebsd" ];
      toPackagesList = platform: { name = platform; value = forBuildSystem platform; };
      packagesList = builtins.map toPackagesList buildPlatforms;
    in builtins.listToAttrs packagesList;
  };
}