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    GTK+ 2.18 supports showing links inside a GtkLabel, similar to
    SexyUrlLabel. Porting from SexyUrlLabel to GtkLabel is relatively
    straightforward. GtkLabel accepts links in the markup using the
    same HTML a notation that SexyUrlLabel uses. In addition
    to the href attribute, GtkLabel accepts a title attribute that
    is displayed as a tooltip on the link. Instead of
    sexy_url_label_set_markup(), just call gtk_label_set_markup().
  
    One difference between the two APIs is that the ::url-activated signal
    from SexyUrlLabel has been replaced by the “activate-link”
    signal. The need for connecting to this signal is greatly reduced,
    since GtkLabel has a default handler that calls gtk_show_uri().