[MacPorts] #55380: darktable +quartz compile error

[MacPorts]

#55380: darktable +quartz compile error
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  Reporter:  breadncup  |      Owner:
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  highsierra
      Port:  darktable  |
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Comment (by ctreleaven):

 Replying to [comment:4 breadncup]:
 > {{{
 > ~ $ xcodebuild -version
 > Xcode 9.0
 > Build version 9A235
 > }}}

 Please try updating to the latest version of Xcode which I believe is 9.1.
 Update the command line tools at the same time.

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Ticket URL: <https://trac.macports.org/ticket/55380#comment:5>
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