[MacPorts] #50305: gtkglext @1.2.0 +quartz: error: X development libraries not found

[MacPorts]

#50305: gtkglext @1.2.0 +quartz: error: X development libraries not found
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  Reporter:  me@…      |      Owner:  jd@…
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.4
Resolution:            |   Keywords:
      Port:  gtkglext  |
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Comment (by me@…):

 I'm using the same variants that were installed before the upgrade.  That
 doesn't sound like something that would work before a Mac OS upgrade but
 not after.  Can someone confirm whether this problem occurs on other
 systems?

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Ticket URL: <https://trac.macports.org/ticket/50305#comment:2>
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