[MacPorts] #70071: graphviz-oldgui fails to extract with old macOS gnutar: A lone zero block at 6236

[MacPorts]

#70071: graphviz-oldgui fails to extract with old macOS gnutar: A lone zero block
at 6236
------------------------------+------------------------
  Reporter:  barracuda156     |      Owner:  ryandesign
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.9.3
Resolution:                   |   Keywords:
      Port:  graphviz-oldgui  |
------------------------------+------------------------

Comment (by ryandesign):

 Which old macOS version? The only reason this port exists is for Tiger;
 see #18175.

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Ticket URL: <https://trac.macports.org/ticket/70071#comment:1>
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