[MacPorts] #59455: py37-pyobjc-cocoa: ValueError: invalid literal for int() with base 10: ''

[MacPorts]

#59455: py37-pyobjc-cocoa: ValueError: invalid literal for int() with base 10: ''
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  Reporter:  pietvo           |      Owner:  (none)
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:                   |   Keywords:
      Port:  py-pyobjc-cocoa  |
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Comment (by jmroot):

 So there are two things wrong: it's not recognising the -isysroot flag we
 use, and it's assuming that the SDK returned by xcrun will always have a
 version number in its name.

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Ticket URL: <https://trac.macports.org/ticket/59455#comment:4>
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