[MacPorts] #61560: mpir: configure failure

[MacPorts]

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

 Builds for me on macOS 11.1 20C5061b && Xcode 12.2 12B5035g ... and,
 configure now correctly looks for the things, rather than erroring out due
 to a missing function definition or some syntax error.

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Ticket URL: <https://trac.macports.org/ticket/61560#comment:10>
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