Thanks-to: Maciej S. Szmigiero
Source: https://bugs.gentoo.org/961943

--- a/src/ui-hotkey-dialog.c
+++ b/src/ui-hotkey-dialog.c
@@ -248,6 +248,8 @@
 	gtk_window_set_transient_for(GTK_WINDOW(dialog->hotkey_dialog), parent);
 
 	/* Connect ui signal handlers */
+	gtk_builder_add_callback_symbol(builder, "on_hotkey_dialog_key_press_event", G_CALLBACK(on_hotkey_dialog_key_press_event));
+	gtk_builder_add_callback_symbol(builder, "on_hotkey_dialog_key_release_event", G_CALLBACK(on_hotkey_dialog_key_release_event));
 	gtk_builder_connect_signals(builder, dialog);
 
 	/* Cleanup */
--- a/src/ui-popup-menu.c
+++ b/src/ui-popup-menu.c
@@ -330,6 +330,11 @@
 #endif
 
 	/* Connect ui signal handlers */
+	gtk_builder_add_callback_symbol(builder, "on_mute_item_activate", G_CALLBACK(on_mute_item_activate));
+	gtk_builder_add_callback_symbol(builder, "on_mixer_item_activate", G_CALLBACK(on_mixer_item_activate));
+	gtk_builder_add_callback_symbol(builder, "on_prefs_item_activate", G_CALLBACK(on_prefs_item_activate));
+	gtk_builder_add_callback_symbol(builder, "on_reload_item_activate", G_CALLBACK(on_reload_item_activate));
+	gtk_builder_add_callback_symbol(builder, "on_about_item_activate", G_CALLBACK(on_about_item_activate));
 	gtk_builder_connect_signals(builder, menu);
 
 	/* Connect audio signal handlers */
--- a/src/ui-popup-window.c
+++ b/src/ui-popup-window.c
@@ -476,6 +476,10 @@
 	configure_vol_increment(GTK_ADJUSTMENT(window->vol_scale_adj));
 
 	/* Connect ui signal handlers */
+	gtk_builder_add_callback_symbol(builder, "on_popup_window_event", G_CALLBACK(on_popup_window_event));
+	gtk_builder_add_callback_symbol(builder, "on_vol_scale_value_changed", G_CALLBACK(on_vol_scale_value_changed));
+	gtk_builder_add_callback_symbol(builder, "on_mute_check_toggled", G_CALLBACK(on_mute_check_toggled));
+	gtk_builder_add_callback_symbol(builder, "on_mixer_button_clicked", G_CALLBACK(on_mixer_button_clicked));
 	gtk_builder_connect_signals(builder, window);
 
 	/* Connect audio signal handlers */
--- a/src/ui-prefs-dialog.c
+++ b/src/ui-prefs-dialog.c
@@ -922,6 +922,13 @@
 	gtk_window_set_transient_for(GTK_WINDOW(dialog->prefs_dialog), parent);
 
 	/* Connect ui signal handlers */
+	gtk_builder_add_callback_symbol(builder, "on_noti_enable_check_toggled", G_CALLBACK(on_noti_enable_check_toggled));
+	gtk_builder_add_callback_symbol(builder, "on_card_combo_changed", G_CALLBACK(on_card_combo_changed));
+	gtk_builder_add_callback_symbol(builder, "on_vol_text_check_toggled", G_CALLBACK(on_vol_text_check_toggled));
+	gtk_builder_add_callback_symbol(builder, "on_vol_meter_draw_check_toggled", G_CALLBACK(on_vol_meter_draw_check_toggled));
+	gtk_builder_add_callback_symbol(builder, "on_middle_click_combo_changed", G_CALLBACK(on_middle_click_combo_changed));
+	gtk_builder_add_callback_symbol(builder, "on_hotkeys_enable_check_toggled", G_CALLBACK(on_hotkeys_enable_check_toggled));
+	gtk_builder_add_callback_symbol(builder, "on_hotkey_event_box_button_press_event", G_CALLBACK(on_hotkey_event_box_button_press_event));
 	gtk_builder_connect_signals(builder, dialog);
 
 	/* Save some references */