[MacPorts] #67926: xfce4-session fails to build with current gtk-3: error: 'GtkWidget' {aka 'struct _GtkWidget'} has no member named 'style'

[MacPorts]

#67926: xfce4-session fails to build with current gtk-3: error: 'GtkWidget' {aka
'struct _GtkWidget'} has no member named 'style'
----------------------------+--------------------
  Reporter:  barracuda156   |      Owner:  (none)
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.8.1
Resolution:                 |   Keywords:
      Port:  xfce4-session  |
----------------------------+--------------------

Comment (by barracuda156):

 This commit might have introduced the breakage:
 https://github.com/macports/macports-
 ports/commit/970aa2c0a90d95ab91a36886791575cef333d50f

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Ticket URL: <https://trac.macports.org/ticket/67926#comment:2>
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