[MacPorts] #56802: gobject-introspection fails to install on 10.14 18A326h due to tar error

[MacPorts]

#56802: gobject-introspection fails to install on 10.14 18A326h due to tar error
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  Reporter:  rben01                 |      Owner:  dbevans
      Type:  defect                 |     Status:  assigned
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.5.3
Resolution:                         |   Keywords:  mojave
      Port:  gobject-introspection  |
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Comment (by AP1010):

 This seems to be a general problem in Mojave. Not specific to any
 particular port. I saw it with AquaTerm. The following example **works**
 in High Sierra, but **fails** in Mojave:
 1. Create two tar archives. One containing a file named 'file', the second
 one containing a file named 'File'
 2. Extract first archive to empty directory
 3. Try extracting the second one into the same directory.
 4. it fails with "Can't unlink already-existing object"

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Ticket URL: <https://trac.macports.org/ticket/56802#comment:13>
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