[MacPorts] #62878: openmpi: fix builds for MacOS 10.8 and earlier; mark known_fail, for cases not easily fixable

[MacPorts]

#62878: openmpi: fix builds for MacOS 10.8 and earlier; mark known_fail, for cases
not easily fixable
----------------------+----------------------
  Reporter:  jmroot   |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  openmpi  |
----------------------+----------------------

Comment (by Christopher Nielsen <mascguy@…>):

 In [changeset:"15d5dc2fe3fb22241ca35a1f93afcb25024b2795/macports-ports"
 15d5dc2fe3fb22241ca35a1f93afcb25024b2795/macports-ports] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="15d5dc2fe3fb22241ca35a1f93afcb25024b2795"
 openmpi/mpich: disable default (gcc) build when necessary; cleanup

 See: https://trac.macports.org/ticket/62878
 See: https://trac.macports.org/ticket/62887
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62878#comment:20>
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