[MacPorts] #56260: gtkglext 1.2.0 build failure

[MacPorts]

#56260: gtkglext  1.2.0  build failure
-------------------------+----------------------
 Reporter:  jbuencuerpo  |      Owner:  (none)
     Type:  defect       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.4.2
 Keywords:               |       Port:  gtkglext
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 I have tried to build gtkglext +quartz without success.
 I attach the main.log file. I have encountered this when trying to build
 gwyddion in an isolated installation of macports. (/opt/gwyddion)

 The error is in gdkglshapes I think. By accesing the work path of the
 build and running make I obtain:

 gdkglshapes.c:552:12: error: redefinition of 'index' as different kind of
 symbol
 static int index[20][3] =

 My os and xcode version:
 xcode version 9.2
 macOS 10.12.6

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Ticket URL: <https://trac.macports.org/ticket/56260>
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