{
  description = "Felixalb System flake";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
    unstable.url = "github:NixOS/nixpkgs/nixos-unstable";

    nix-darwin.url = "github:lnl7/nix-darwin/master";
    nix-darwin.inputs.nixpkgs.follows = "nixpkgs";

    home-manager.url = "github:nix-community/home-manager/release-23.05";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";

    matrix-synapse-next.url = "github:dali99/nixos-matrix-modules";

    sops-nix.url = "github:Mic92/sops-nix";
    sops-nix.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = {
    self
    , home-manager
    , matrix-synapse-next
    , nix-darwin
    , nixpkgs
    , sops-nix
    , unstable
  , ... }@inputs:
    let
      overlay-unstable = final: prev: {
        unstable = unstable.legacyPackages.${prev.system};
      };
    in
    {
      nixosConfigurations = {
        voyager = nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          specialArgs = {
            inherit inputs;
          };
          modules = [
            # Overlays-module makes "pkgs.unstable" available in configuration.nix
            ({ config, pkgs, ... }: { nixpkgs.overlays = [ overlay-unstable ]; })

            ./hosts/voyager/configuration.nix
            sops-nix.nixosModules.sops
            matrix-synapse-next.nixosModules.synapse
          ];
        };
        chapel = nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          specialArgs = {
            inherit inputs;
          };
          modules = [
            ./hosts/chapel/configuration.nix
            sops-nix.nixosModules.sops
          ];
        };
        redshirt = nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          specialArgs = {
            inherit inputs;
          };
          modules = [
            ./hosts/redshirt/configuration.nix
            ({ config, pkgs, ... }: { nixpkgs.overlays = [ overlay-unstable ]; })
            sops-nix.nixosModules.sops
          ];
        };
      };

      darwinConfigurations.worf = nix-darwin.lib.darwinSystem {
        system = "aarch64-darwin";
        specialArgs = {
          inherit inputs;
        };
        modules = [
          ./hosts/worf/configuration.nix
          ({ config, pkgs, ... }: { nixpkgs.overlays = [ overlay-unstable ]; })
          home-manager.darwinModules.home-manager {
            home-manager.useGlobalPkgs = true;
            home-manager.useUserPackages = true;
            home-manager.users."felixalb" = import ./hosts/worf/home.nix;
          }
          # sops-nix.nixosModules.sops
        ];
      };

      devShells.x86_64-linux = {
        default = nixpkgs.legacyPackages.x86_64-linux.callPackage ./shell.nix { };
      };

      devShells.aarch64-darwin = {
        default = nixpkgs.legacyPackages.aarch64-darwin.callPackage ./shell.nix { };
      };
    };
}