[MacPorts] #56809: webkit2-gtk +gtk2 +x11 won't build; fatal error: 'gst/gl/x11/gstgldisplay_x11.h' file not found

[MacPorts]

#56809: webkit2-gtk +gtk2 +x11 won't build; fatal error:
'gst/gl/x11/gstgldisplay_x11.h' file not found
--------------------------+--------------------
  Reporter:  posita       |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.5.2
Resolution:               |   Keywords:
      Port:  webkit2-gtk  |
--------------------------+--------------------

Comment (by kencu):

 there have been a lot of changes in the `gstreamer*` ports
 lately...perhaps that has changed something with the build. I'll see if it
 still builds on 10.12 for me.

 what's with all the {{PREFIX}} stuff?

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Ticket URL: <https://trac.macports.org/ticket/56809#comment:1>
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