[MacPorts] #64349: ruby31: error: use of undeclared identifier 'MAP_ANONYMOUS'

[MacPorts]

#64349: ruby31: error: use of undeclared identifier 'MAP_ANONYMOUS'
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  Reporter:  ryandesign  |      Owner:  kimuraw
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:
      Port:  ruby31      |
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Comment (by ryandesign):

 I've reported it to the developers: https://bugs.ruby-
 lang.org/issues/18556

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Ticket URL: <https://trac.macports.org/ticket/64349#comment:1>
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