{
  nixConfig = {
    extra-substituters = [ "https://cache.clan.lol" ];
    extra-trusted-public-keys = [
      "cache.clan.lol-1:3KztgSAB5R1M+Dz7vzkBGzXdodizbgLXGXKXlcQLA28="
    ];
  };

  inputs = {
    munix.url = "git+https://git.clan.lol/clan/munix?shallow=1&ref=main";
    nixpkgs.follows = "munix/nixpkgs";
  };

  outputs =
    {
      self,
      nixpkgs,
      munix,
      ...
    }:
    {
      # First, define system configuration in a module:
      nixosModules.musictest =
        { pkgs, ... }:
        {
          system.stateVersion = "26.05";
          programs.dconf.enable = true;
          fonts.packages = with pkgs; [ adwaita-fonts ];
          environment.systemPackages = with pkgs; [ euphonica ];
          # Local background service as a demo that doesn't require network creds :)
          services.mpd = {
            enable = true;
            startWhenNeeded = true;
            musicDirectory = "/etc/demo-music";
            user = "appvm";
            group = "appvm";
            extraConfig = ''
              audio_output {
                type "pipewire"
                name "Pipewire Output"
              }
            '';
          };
          environment.etc."demo-music/0101GhostsI.ogg".source = pkgs.fetchurl {
            # just a CC-BY-SA licensed example
            url = "https://archive.org/download/NineInchNailsGhostsI-Iv24bit48khz/0101GhostsI.ogg";
            sha256 = "0iijm1c191aqkxybl4a4gvlpnf72hk4896lwvp0xixkhds88qzxi";
          };
        };

      # And then define system closures per arch using the module above:
      nixosConfigurations.musictest-aarch64 = nixpkgs.lib.nixosSystem {
        system = "aarch64-linux";
        modules = [
          munix.nixosModules.default
          self.nixosModules.musictest
        ];
      };
      nixosConfigurations.musictest-x86_64 = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          munix.nixosModules.default
          self.nixosModules.musictest
        ];
      };

      apps.aarch64-linux.default = {
        type = "app";
        program = "${
          nixpkgs.legacyPackages.aarch64-linux.symlinkJoin {
            name = "munix";
            paths = [ munix.packages.aarch64-linux.munix ];
            buildInputs = [ nixpkgs.legacyPackages.aarch64-linux.makeWrapper ];
            postBuild = ''
              wrapProgram $out/bin/munix --add-flags ${self.nixosConfigurations.musictest-aarch64.config.system.build.toplevel} --set MICROVM_DEFAULT_COMMAND euphonica
            '';
          }
        }/bin/munix";
        meta.description = "Run Music Demo App";
      };
      apps.x86_64-linux.default = {
        type = "app";
        program = "${
          nixpkgs.legacyPackages.x86_64-linux.symlinkJoin {
            name = "munix";
            paths = [ munix.packages.x86_64-linux.munix ];
            buildInputs = [ nixpkgs.legacyPackages.x86_64-linux.makeWrapper ];
            postBuild = ''
              wrapProgram $out/bin/munix --add-flags ${self.nixosConfigurations.musictest-x86_64.config.system.build.toplevel} --set MICROVM_DEFAULT_COMMAND euphonica
            '';
          }
        }/bin/munix";
        meta.description = "Run Music Demo App";
      };
    };
}