[MacPorts] #66712: ruby31 fails to build on 10.5 - cstdbool not found

[MacPorts]

#66712: ruby31 fails to build on 10.5 - cstdbool not found
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  Reporter:  rmottola  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  leopard legacy
      Port:  ruby31    |
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Changes (by rmottola):

 * Attachment "main.log" added.

 Build log on 10.5 64bit default clang7

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Ticket URL: <https://trac.macports.org/ticket/66712>
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