[MacPorts] #49669: port upgrade outdated @ MacPorts 2.3.4 Error: Unable to open port: can't read "mpi.default": no such variable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#49669: port upgrade outdated @ MacPorts 2.3.4 Error: Unable to open port: can't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
--------------------------+------------------------
  Reporter:  rioyokota@…  |      Owner:  dstrubbe@…
      Type:  defect       |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.4
Resolution:  fixed        |   Keywords:  haspatch
      Port:               |
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Comment (by hosamani@…):

 Hey all, First time reporter here, please bear with me. My issue is
 identical to the OP. I see you guys have promptly released a patch to fix
 it fast. However being a novice, I am having trouble using the patch fix
 the issue. I have read the "how to" section and the 4.5 in the Macport
 guide. But unfortunately none of them speak about this scenario! Both
 those resources about fixing a specific port. Since this is not a port
 that is damaged here, could someone tell me how would I go about using the
 patch to fix the issue.

 Thank you

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Ticket URL: <https://trac.macports.org/ticket/49669#comment:13>
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