[MacPorts] #57513: bazel @0.18.0: error: no type named 'unique_ptr' in namespace 'std'

[MacPorts]

#57513: bazel @0.18.0: error: no type named 'unique_ptr' in namespace 'std'
-------------------------+--------------------------
  Reporter:  ryandesign  |      Owner:  RootFunction
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  bazel       |
-------------------------+--------------------------

Comment (by kencu):

 tensorflow, indeed.

 I have this broken bone about keeping old systems working smoothly. Did I
 mention I have both a Mac SE/30 and MacII si on my desk, working
 perfectly?

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Ticket URL: <https://trac.macports.org/ticket/57513#comment:9>
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