{
  description = "Home Manager configuration of moustachioed";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    nix-darwin.url = "github:LnL7/nix-darwin";
    nix-darwin.inputs.nixpkgs.follows = "nixpkgs";
    home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = { self, nix-darwin, nixpkgs, home-manager, ... }:
    let
      #system = "x86_64-darwin";
      system = "x86_64-linux";
      pkgs = nixpkgs.legacyPackages.${system};

      configuration = { pkgs, ... }: {
        environment.systemPackages =
          [
            pkgs.vim
          ];

        # Auto upgrade nix package and the daemon service.
        services.nix-daemon.enable = true;
        # nix.package = pkgs.nix;

        nix.settings.experimental-features = "nix-command flakes";

        programs.zsh.enable = true;  # default shell on catalina

        # Set Git commit hash for darwin-version.
        system.configurationRevision = self.rev or self.dirtyRev or null;

        # Used for backwards compatibility, please read the changelog before changing.
        # $ darwin-rebuild changelog
        system.stateVersion = 4;

        # The platform the configuration will be used on.
        nixpkgs.hostPlatform = system;
      };
    in {
      # Build darwin flake using:
      # $ darwin-rebuild build --flake .#Martins-MacBook-Pro
      darwinConfigurations."Martins-MacBook-Pro" = nix-darwin.lib.darwinSystem {
        modules = [ configuration ];
      };

      # Expose the package set, including overlays, for convenience.
      darwinPackages = self.darwinConfigurations."Martins-MacBook-Pro".pkgs;

      homeConfigurations = { 
        "moustachioed" = home-manager.lib.homeManagerConfiguration {
          inherit pkgs;

          modules = [ 
            ./user/profiles/moustachioedBook.nix
            ./common.nix
            ./user/task_home.nix
          ];
        };

        "martin" = home-manager.lib.homeManagerConfiguration {
          inherit pkgs;

          modules = [ 
            ./user/profiles/martin.nix
            ./common.nix
            ./user/task_home.nix
          ];
        };

        "pan" = home-manager.lib.homeManagerConfiguration {
          inherit pkgs;

          modules = [ 
            ./user/profiles/work.nix
            ./common.nix
            ./user/task.nix
            {
              nixpkgs.config.allowUnfree = true;
            }
          ];
        };
      };
    };
}