[MacPorts] #59483: MacPorts base 2.6.2 fails to build or upgrade on 10.13 with Xcode 10.1 installed as cannot build darwintrace +universal

[MacPorts]

#59483: MacPorts base 2.6.2 fails to build or upgrade on 10.13 with Xcode 10.1
installed as cannot build darwintrace +universal
---------------------+----------------------
  Reporter:  kencu   |      Owner:  jmr
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.6.2
Resolution:          |   Keywords:
      Port:          |
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Comment (by kencu):

 After being installed for months on that system,  Xcode now brings up the
 install additional components dialog, then errors out when it tries to do
 so.

 So yes indeed it appears that this could be something local on that
 system. Will sort out toolchain and try again.

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Ticket URL: <https://trac.macports.org/ticket/59483#comment:2>
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