[MacPorts] #56778: gstreamer1-gst-plugins-base build fails on latest upgrade

[MacPorts]

#56778: gstreamer1-gst-plugins-base build fails on latest upgrade
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  Reporter:  squizzgitmon                 |      Owner:  (none)
      Type:  defect                       |     Status:  new
  Priority:  Normal                       |  Milestone:
 Component:  ports                        |    Version:
Resolution:                               |   Keywords:
      Port:  gstreamer1-gst-plugins-base  |
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Comment (by Ionic):

 Okay, that explains your situation.

 `+x11` was the default variant in the past. I have added `+cocoa` a few
 days ago, but it turned out that having both the GLX (x11) and Cocoa
 OpenGL backend enabled is a bad idea, since we really don't want to link
 two different OpenGL implementations into the same binary.

 Your platform supports both, so we cannot hide either to make it
 unavailable and resolve the conflict.

 I probably could forcefully disable either cocoa or x11 if both are set.
 Since the X11 backend actually works and the Cocoa does not really work, I
 guess we should go for preferring the `x11` variant.

 Will test around with that tomorrow to give users a better upgrade path if
 possible.

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Ticket URL: <https://trac.macports.org/ticket/56778#comment:6>
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