error: use of undeclared identifier 'bitsdojo_window_from'

linux/my_application.cc

// NEEDED BY bitsdojo_window.dart
auto bdw = bitsdojo_window_from(window);
bdw->setCustomFrame(true);
//gtk_window_set_default_size(window, 1280, 720);

gtk_widget_show(GTK_WIDGET(window));

my_app.dart

void main() {
   runApp(const MyApp());

   doWhenWindowReady((){
       appWindow.title = 'MyTitle'; }); }

And I get

Building Linux application... /var/home/tomek/DartProjects/senver/linux/my_application.cc:51:14: error: use of undeclared identifier 'bitsdojo_window_from' Exception: Build process failed

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$ flutter --version

Flutter 2.10.5 • channel stable • https://github.com/flutter/flutter.git Framework • revision 5464c5bac7 (3 weeks ago) • 2022-04-18 09:55:37 -0700 Engine • revision 57d3bac3dd Tools • Dart 2.16.2 • DevTools 2.9.2

*

Android Studio Bumblebee | 2021.1.1 Patch 3 Build #AI-211.7628.21.2111.8309675, built on March 16, 2022 Runtime version: 11.0.11+0-b60-7590822 amd64 VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o. Linux 5.17.5-200.fc35.x86_64 GC: G1 Young Generation, G1 Old Generation Memory: 1280M Cores: 4 Registry: external.system.auto.import.disabled=true Non-Bundled Plugins: com.github.mzdm.embedded_dartpad (0.0.4), Dart (211.7817), org.jetbrains.kotlin (211-1.6.21-release-334-AS7442.40), io.flutter (67.0.1) Current Desktop: GNOME

*

$ cat /etc/fedora-release

Fedora release 35 (Thirty Five)

bitsdojo / bitsdojo_window