[MacPorts] #61560: mpir: configure failure

[MacPorts]

#61560: mpir: configure failure
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  Reporter:  tungyuanhsiao  |      Owner:  michaelld
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.6.4
Resolution:                 |   Keywords:
      Port:  mpir           |
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Comment (by AndyLinwood):

 Met the same problem, too. macOS Big Sur

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Ticket URL: <https://trac.macports.org/ticket/61560#comment:5>
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