[MacPorts] #57462: gstreamer1-gst-plugins-base 1.14.4: fails to build under OSX 10.11.6

[MacPorts]

#57462: gstreamer1-gst-plugins-base 1.14.4: fails to build under OSX 10.11.6
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  Reporter:  thetrial                     |      Owner:  (none)
      Type:  defect                       |     Status:  new
  Priority:  Normal                       |  Milestone:
 Component:  ports                        |    Version:  2.5.4
Resolution:                               |   Keywords:  sse2
      Port:  gstreamer1-gst-plugins-base  |
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Comment (by kencu):

 you might use variant_isset to either add the default +x11 or error out if
 it is not set.

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Ticket URL: <https://trac.macports.org/ticket/57462#comment:17>
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