{
  inputs,
  config,
  ...
}: {
  flake.nixngConfigurations.mautrixSlack = inputs.nixng.nglib.makeSystem {
    system = "x86_64-linux";
    name = "mautrix-slack";
    inherit (inputs) nixpkgs;
    config = {
      pkgs,
      lib,
      ...
    }: {
      dumb-init = {
        enable = true;
        type.services = {};
      };

      init.services.mautrix-slack = {
        enabled = true;
        shutdownOnExit = true;
        script = let
          inherit
            (lib)
            getExe'
            makeBinPath
            ;
          mautrix-slack = (pkgs.appendOverlays [config.flake.overlays.mautrix-slack]).mautrix-slack;
        in
          pkgs.writeShellScript "mautrix-slack"
          ''
            DATA_DIR="/var/lib/mautrix-slack"
            CONFIG_FILE="$DATA_DIR/config.yaml"
            REGISTRATION_FILE="/var/lib/registrations/mautrix-slack.yaml"

            ${getExe' pkgs.envsubst "envsubst"} < ${./mautrix-slack.yaml} > "$CONFIG_FILE"
            chmod 755 "$CONFIG_FILE"

            export PATH="$PATH:${makeBinPath [pkgs.lottieconverter]};"

            [ -e "$REGISTRATION_FILE" ] || \
              ${getExe' mautrix-slack "mautrix-slack"} -c "$CONFIG_FILE" -r "$REGISTRATION_FILE" -g
            ${getExe' mautrix-slack "mautrix-slack"} -c "$CONFIG_FILE" -r "$REGISTRATION_FILE" -n
          '';
      };
    };
  };
}