[MacPorts] #57234: Some ports are failing to build due to new build system in Xcode 10

[MacPorts]

#57234: Some ports are failing to build due to new build system in Xcode 10
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  Reporter:  mf2k                                |      Owner:  (none)
      Type:  defect                              |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:  xcode10
      Port:  BGHUDAppKit  cotvnc gimp-app        |
  macports-notifier MacVim pinentry-mac          |
  terminal-notifier unison VLC xhyve             |
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Comment (by kencu):

 Replying to [comment:11 kencu]:
 > > it means that the include statements in the sources are incorrectly
 using angle brackets instead of double quotes.
 >
 > This behaviour seems to have changed in Xcode10. I am unable to find any
 documentation about exactly what is different about the CPP search path
 handling anywhere on the web so far (if that is what this is about). I
 would appreciate any information anyone knows about this.

 I found some documentation about this change in header path searching, and
 other changes in the build system that we've been running into:
 <https://developer.apple.com/documentation/xcode_release_notes/xcode_10_release_notes/build_system_release_notes_for_xcode_10>

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Ticket URL: <https://trac.macports.org/ticket/57234#comment:26>
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