[MacPorts] #39836: when xcode license was not accepted there should be a helpful error message

[MacPorts]

#39836: when xcode license was not accepted there should be a helpful error message
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  Reporter:  fabian@…     |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.1.3
Resolution:               |   Keywords:
      Port:               |
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Comment (by dports@…):

 We could look for that error message in the log. It would be nice to
 display it directly to users rather than require them to look through the
 build log.

 I don't think there's a good way to check whether the license has been
 accepted short of trying xcodebuild and seeing if it fails. `xcodebuild
 -version` works even if the license has been accepted, and `xcodebuild
 -license` behaves the same whether you've already accepted the license or
 not.

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Ticket URL: <https://trac.macports.org/ticket/39836#comment:4>
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