let
buildMachine = machines: name: config:
  let cfg = if builtins.isPath config then import config else config; in
  (import <nixpkgs/nixos/lib/eval-config.nix> (cfg // {
    extraArgs = { inherit name machines; } // config.extraArgs;
  }));
buildMachines = machines:
  let machinesOut = builtins.mapAttrs (buildMachine machinesOut) machines; in
  builtins.mapAttrs (n: system: system.config) machinesOut;
in buildMachines {
  mermet = machines/mermet.nix;
  losurdo = machines/losurdo.nix;
}