fix add missing dep

backend/converted.nix

@@ -1,18 +1,20 @@
-{ mkDerivation
-, aeson
-, base
-, bytestring
-, classy-prelude
-, http-types
-, lib
-, lifted-base
-, mtl
-, text
-, uuid
-, wai
-, wai-extra
-, warp
-, websockets
+{
+  mkDerivation,
+  aeson,
+  base,
+  bytestring,
+  classy-prelude,
+  http-types,
+  lib,
+  lifted-base,
+  mtl,
+  text,
+  uuid,
+  wai,
+  wai-extra,
+  warp,
+  websockets,
+  optparse-applicative,
 }:
 mkDerivation {
   pname = "jitsi-rooms";
@@ -34,6 +36,7 @@ mkDerivation {
     wai-extra
     warp
     websockets
+    optparse-applicative
   ];
   executableHaskellDepends = [
     aeson
@@ -49,6 +52,7 @@ mkDerivation {
     wai-extra
     warp
     websockets
+    optparse-applicative
   ];
   homepage = "https://github.com/githubuser/jitsi-rooms#readme";
   license = lib.licenses.bsd3;

nixos.nix

@@ -13,6 +13,7 @@ let
   backend = (pkgs.callPackage ./backend/default.nix { });
   frontend = (pkgs.callPackage ./frontend/default.nix { });
   prodsodyPackage = (pkgs.callPackage ./prodsody/default.nix { });
+  notifyScript = "/run/current-system/sw/bin/send-signal-jitsi-notify";
 in
 {
   options.services.jitsi-rooms = {
@@ -31,7 +32,7 @@ in
       after = [ "network.target" ];
 
       serviceConfig = {
-        ExecStart = "${backend}/bin/jitsi-rooms-exe";
+        ExecStart = "${backend}/bin/jitsi-rooms-exe -n ${notifyScript}";
         DynamicUser = true;
         User = "jitsi-rooms-backend";
       };