In geniuspaste/src/geniuspaste.c:

> @@ -601,6 +620,13 @@ static void show_msgbox(GtkMessageType type, GtkButtonsType buttons,
>                         "secondary-text", markup,
>                         "secondary-use-markup", TRUE,
>                         NULL);
> +    /* fetch the message area of the dialog and attach a custom URL hook to the labels */
> +    dlg_vbox = gtk_message_dialog_get_message_area(GTK_MESSAGE_DIALOG(dlg));
> +    gtk_container_foreach(
> +        GTK_CONTAINER(dlg_vbox),
> +        (GtkCallback)message_dialog_label_set_url_hook,

no need for the GtkCallback cast as the function has (and should have) the appropriate signature.

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