[MacPorts] #50305: gtkglext configure error on El Capitan

[MacPorts]

#50305: gtkglext configure error on El Capitan
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 Reporter:  me@…    |      Owner:  macports-tickets@…
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.3.4
 Keywords:          |       Port:  gtkglext
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 After upgrading to El Capitan and reinstalling macports, while
 reinstalling previously requested ports, gtkglext fails to configure.  I
 don't see any obviously fatal errors in the attached configure log.

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