[MacPorts] #68889: proj6 build error: error: 'int64_t' in namespace 'std' does not name a type

[MacPorts]

#68889: proj6 build error: error: 'int64_t' in namespace 'std' does not name a type
-------------------------+-------------------------------------------------
  Reporter:              |      Owner:  stromnov
  barracuda156           |
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.8.1
Resolution:              |   Keywords:  tiger, leopard, snowleopard,
      Port:  proj6,      |  powerpc
  proj7, proj8           |
-------------------------+-------------------------------------------------

Comment (by barracuda156):

 I have already made a PR for this https://github.com/macports/macports-
 ports/pull/21774

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Ticket URL: <https://trac.macports.org/ticket/68889#comment:4>
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