The Pango-overline enumeration is used to specify whether text should be overlined, and if so, the type of line.

(define-g-enum "PangoOverline" pango-overline
  (:export t
   :type-initializer "pango_overline_get_type")
  (:none 0)
  (:single 1))  

:none

No overline should be drawn.

:single

Draw a single line above the ink extents of the text being underlined.

Since 1.46