[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
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  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 jmroot):

 You appear to be missing the command line tools.

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Ticket URL: <https://trac.macports.org/ticket/59483#comment:1>
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