diff -r 2533cdebf6ef -r 3a77b9048664 ui/gtk/toolkit.h
--- a/ui/gtk/toolkit.h	Sun Jun 09 10:24:49 2024 +0200
+++ b/ui/gtk/toolkit.h	Sun Jun 09 15:26:20 2024 +0200
@@ -76,6 +76,10 @@
 void ui_set_active_window(UiObject *obj);
 UiObject *ui_get_active_window();
 
+#if GTK_MAJOR_VERSION >= 3
+void ui_css_init(void);
+#endif
+
 #ifdef	__cplusplus
 }
 #endif