[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:  closed
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:  fixed    |   Keywords:
      Port:  openmpi  |
----------------------+---------------------

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

 In [changeset:"a459e5eb7291e2e0e9d5cb3d9e5015bc195842dc/macports-ports"
 a459e5eb7291e2e0e9d5cb3d9e5015bc195842dc/macports-ports] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="a459e5eb7291e2e0e9d5cb3d9e5015bc195842dc"
 openmpi/mpich: gcc subports: don't depend on clang 9 for PPC
 See: https://trac.macports.org/ticket/59239
 See: https://trac.macports.org/ticket/62878
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62878#comment:25>
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