[MacPorts] #59097: gmp: fails to build with MacPorts 2.6.0 on < 10.9

[MacPorts]

#59097: gmp: fails to build with MacPorts 2.6.0 on < 10.9
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  Reporter:  mojca   |      Owner:  MarcusCalhoun-Lopez
      Type:  defect  |     Status:  assigned
  Priority:  High    |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  gmp     |
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Comment (by mojca):

 For me a perfectly fine workaround was to have clang 8.0 installed before
 installing gmp (but clang 8.0 came from the buildbot).

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Ticket URL: <https://trac.macports.org/ticket/59097#comment:3>
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