[MacPorts] #57174: cotvnc wont compile

[MacPorts]

#57174: cotvnc wont compile
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  Reporter:  axet    |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  xcode10
      Port:  cotvnc  |
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Comment (by kencu):

 This one is bugging me. The usual fixes (useoldbuildsystem, set the
 deriveddata path) don't reliably work. Just to make it tantalizing, it
 _did_ work once or twice on High Sierra with Xcode10, but it is not
 reproducible. Frustrating one.

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Ticket URL: <https://trac.macports.org/ticket/57174#comment:7>
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