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

  outputs = { self, nixpkgs, ...} @ inputs: let
    systems = [
      "aarch64-linux"
      "x86_64-linux"
    ];
    forAllSystems = nixpkgs.lib.genAttrs systems;
  in rec {
    devShells = forAllSystems (system: let
      pkgs = nixpkgs.legacyPackages.${system};
      in pkgs.mkShell {
        buildInputs = with pkgs; [
          just
        ];
      }
    );

    nixosModules = rec {
      default = enableTachikoma;
      enableTachikoma = { pkgs, ...}: {
        services.akkoma.package = packages.${pkgs.system}.akkoma.tachikoma;
        services.akkoma.frontends.primary = {
          name = "tachikoma-fe";
          ref = "stable";
          package = packages.${pkgs.system}.akkoma-frontends.tachikoma-fe;
        };
      };
    };

    packages = forAllSystems (system: let 
      pkgs = nixpkgs.legacyPackages.${system};
      lib = pkgs.lib;
      patchSet = dirPath: builtins.filterList (file: lib.strings.hasSuffix ".patch" file) (builtins.attrNames (builtins.readDir dirPath));
    in rec {
      default = akkoma.tachikoma;

      akkoma.tachikoma = let 
        rev = builtins.readFile ./akkoma/upstream.txt; 
      in pkgs.akkoma.overrideAttrs (final: prev: {
        version = "${rev}-tachikoma";

        src = fetchFromGitea {
          inherit rev;
          domain = "akkoma.dev";
          owner = "AkkomaGang";
          repo = "akkoma";
          hash = "sha256-MPUZFcIxZ21fe3edwi+/Kt8qpwNBCh40wheC3QMqw2M=";
        };

        patches = prev.patches ++ patchSet ./akkoma;
        patchFlags = "-p1 -F5";
      });

      akkoma-frontends.tachikoma-fe = let 
        rev = builtins.readFile ./akkoma-fe/upstream.txt; 
      in pkgs.akkoma-frontends.tachikoma-fe.overrideAttrs (final: prev: {
        version = "${rev}-tachikoma";
        
        src = fetchFromGitea {
          inherit rev;
          domain = "akkoma.dev";
          owner = "AkkomaGang";
          repo = "akkoma-fe";
          hash = "sha256-MPUZFcIxZ21fe3edwi+/Kt8qpwNBCh40wheC3QMqw2M=";
        };

        patches = prev.patches ++ patchSet ./akkoma-fe;
        patchFlags = "-p1 -F5";
      });
    });
  };
}