{
  description = "Felixalb System flake";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
    unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
    nixpkgs-2211.url = "https://github.com/NixOS/nixpkgs/archive/34bfa9403e42eece93d1a3740e9d8a02fceafbca.tar.gz"; # old nixpgks for e.g. remmina

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

    home-manager.url = "github:nix-community/home-manager/release-24.05";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";

    matrix-synapse-next.url = "github:dali99/nixos-matrix-modules/v0.6.0";
    nix-minecraft.url = "github:Infinidoge/nix-minecraft";

    extra-config.url = "git+file:///home/felixalb/nix-extra-config";

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

  outputs = {
    self
    , home-manager
    , matrix-synapse-next
    , nix-minecraft
    , nix-darwin
    , nixpkgs
    , nixpkgs-2211
    , sops-nix
    , unstable
    , extra-config
  , ... }@inputs:
    let
      pkgs-overlay = final: prev: {
        unstable = unstable.legacyPackages.${prev.system};
        nixpkgs-2211 = nixpkgs-2211.legacyPackages.${prev.system};

        python311 = prev.python311.override {
          packageOverrides = self: super: {
            # k5test is broken on darwin, as of 24.05
            gssapi = super.gssapi.overrideAttrs (old: {
              doInstallCheck = false;
            });
          };
        };

        tlclient = final.unstable.tlclient.overrideAttrs (finalAttrs: previousAttrs: {
          # nixpkgs.config.allowUnfreePredicate doesn't work for the unstable overlay, as it is a different "nixpkgs"
          meta.license.free = true;
        });
      };
    in
    {
      nixosConfigurations = {
        # Networking / VPN Gateway
        burnham = nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          specialArgs = {
            inherit inputs;
          };
          modules = [
            # Overlays-module makes "pkgs.unstable" available in configuration.nix
            ({ config, pkgs, ... }: { nixpkgs.overlays = [ pkgs-overlay ]; })

            ./hosts/burnham/configuration.nix
            ./common/domeneshop-dyndns.nix
            sops-nix.nixosModules.sops
            home-manager.nixosModules.home-manager {
              home-manager.useGlobalPkgs = true;
              home-manager.useUserPackages = true;
              home-manager.users."felixalb" = import ./hosts/burnham/home.nix;
            }
          ];
        };
        # Media / storage server
        challenger = nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          specialArgs = {
            inherit inputs;
          };
          modules = [
            # Overlays-module makes "pkgs.unstable" available in configuration.nix
            ({ config, pkgs, ... }: { nixpkgs.overlays = [ pkgs-overlay ]; })

            ./hosts/challenger/configuration.nix
            extra-config.nixosModules.default
            sops-nix.nixosModules.sops
            home-manager.nixosModules.home-manager {
              home-manager.useGlobalPkgs = true;
              home-manager.useUserPackages = true;
              home-manager.users."felixalb" = import ./hosts/challenger/home.nix;
            }
          ];
        };
        # General application server
        defiant = nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          specialArgs = {
            inherit inputs;
          };
          modules = [
            # Overlays-module makes "pkgs.unstable" available in configuration.nix
            ({ config, pkgs, ... }: { nixpkgs.overlays = [ pkgs-overlay ]; })

            ./hosts/defiant/configuration.nix
            ./common/domeneshop-dyndns.nix
            sops-nix.nixosModules.sops
            matrix-synapse-next.nixosModules.default
            home-manager.nixosModules.home-manager {
              home-manager.useGlobalPkgs = true;
              home-manager.useUserPackages = true;
              home-manager.users."felixalb" = import ./hosts/defiant/home.nix;
            }
          ];
        };
        # Work desktop
        felixalbpc = nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          specialArgs = {
            inherit inputs;
          };
          modules = [
            # Overlays-module makes "pkgs.unstable" available in configuration.nix
            ({ config, pkgs, ... }: { nixpkgs.overlays = [ pkgs-overlay ]; })

            ./hosts/felixalbpc/configuration.nix
            sops-nix.nixosModules.sops
            home-manager.nixosModules.home-manager {
              home-manager.useGlobalPkgs = true;
              home-manager.useUserPackages = true;
              home-manager.users."felixalb" = import ./hosts/felixalbpc/home.nix;
            }
          ];
        };
        # Web host
        malcolm = nixpkgs.lib.nixosSystem {
          system = "x86_64-linux";
          specialArgs = {
            inherit inputs;
          };
          modules = [
            # Overlays-module makes "pkgs.unstable" available in configuration.nix
            ({ config, pkgs, ... }: { nixpkgs.overlays = [ pkgs-overlay ]; })

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