[MacPorts] #62624: ruby30 fails to build on macOS 11.2.3

[MacPorts]

#62624: ruby30 fails to build on macOS 11.2.3
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  Reporter:  josephsacco  |      Owner:  kimuraw
      Type:  defect       |     Status:  accepted
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.6.4
Resolution:               |   Keywords:  ruby,  Big Sur
      Port:  ruby30       |
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Changes (by josephsacco):

 * Attachment "mkmf.log" added.

 mkmf.log

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Ticket URL: <https://trac.macports.org/ticket/62624>
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