[MacPorts] #49669: port upgrade outdated @ MacPorts 2.3.4 Error: Unable to open port: can't read "mpi.default": no such variable

[MacPorts]

#49669: port upgrade outdated @ MacPorts 2.3.4 Error: Unable to open port: can't
read "mpi.default": no such variable
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  Reporter:  rioyokota@…  |      Owner:  macports-tickets@…
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.4
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign@…):

 Please attach the main.log file and/or indicate which port is exhibiting
 this problem.

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Ticket URL: <https://trac.macports.org/ticket/49669#comment:1>
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