{
  inputs,
  lib,
}:
with lib; let
  mkConfiguration = name: {
    modules ? [],
    configuration ? ./${name},
    this ? my.configurations.${name},
  }:
    nameValuePair name (nixosSystem {
      inherit (this) system;
      modules =
        attrValues inputs.self.nixosModules
        ++ modules
        ++ optional (configuration != null) (import configuration);
      specialArgs = {inherit inputs lib this;};
    });
in
  mapAttrs' mkConfiguration {
    # A dummy configuration to test the "headless" profile.
    test-headless = {
      modules = with inputs; [
        "${nixpkgs}/nixos/modules/profiles/qemu-guest.nix"
        nixpkgs.nixosModules.notDetected
      ];
      this = {
        hostname = "test-headless";
        system = "x86_64-linux";
        isHeadless = true;
        isHeadful = false;
      };
    };

    # A dummy configuration to test the "headful" profile.
    test-headful = {
      modules = with inputs; [
        "${nixpkgs}/nixos/modules/profiles/qemu-guest.nix"
        nixpkgs.nixosModules.notDetected
      ];
      this = {
        hostname = "test-headful";
        system = "x86_64-linux";
        isHeadless = false;
        isHeadful = true;
      };
    };

    # A beefy desktop PC: 7950x/rx6750xt/128GB.
    eonwe.modules = with inputs; [
      nixos-hardware.nixosModules.common-cpu-amd
      nixos-hardware.nixosModules.common-gpu-amd
      nixos-hardware.nixosModules.common-pc-ssd
      nixpkgs.nixosModules.notDetected
    ];

    # ThinkPad T480.
    melian.modules = with inputs; [
      nixos-hardware.nixosModules.common-pc-laptop-ssd
      nixos-hardware.nixosModules.lenovo-thinkpad-t480
      nixpkgs.nixosModules.notDetected
    ];

    # VPS: Germany
    manwe.modules = with inputs; [
      "${nixpkgs}/nixos/modules/profiles/qemu-guest.nix"
      nixos-hardware.nixosModules.common-cpu-amd
      nixos-hardware.nixosModules.common-pc-ssd
      nixpkgs.nixosModules.notDetected
    ];

    # VPS: Germany
    varda.modules = with inputs; [
      "${nixpkgs}/nixos/modules/profiles/qemu-guest.nix"
      nixos-hardware.nixosModules.common-cpu-amd
      nixos-hardware.nixosModules.common-pc-ssd
      nixpkgs.nixosModules.notDetected
    ];

    # VPS: France
    yavanna.modules = with inputs; [
      "${nixpkgs}/nixos/modules/profiles/qemu-guest.nix"
      nixos-hardware.nixosModules.common-cpu-intel
      nixos-hardware.nixosModules.common-pc-hdd
      nixpkgs.nixosModules.notDetected
    ];
  }