[MacPorts] #62843: py-cryptography @3.4.7: ports failing to build for MacOS 10.12 and earlier

[MacPorts]

#62843: py-cryptography @3.4.7: ports failing to build for MacOS 10.12 and earlier
------------------------------+----------------------
  Reporter:  mascguy          |      Owner:  stromnov
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:                   |   Keywords:
      Port:  py-cryptography  |
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Comment (by mascguy):

 Here's one example from our buildbots:

 https://build.macports.org/builders/ports-10.12_x86_64-builder/builds/145844/steps
 /install-port/logs/stdio

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Ticket URL: <https://trac.macports.org/ticket/62843#comment:1>
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