[MacPorts] #54993: Processing of port openmpi-gcc7 failed

[MacPorts]

#54993: Processing of port openmpi-gcc7 failed
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  Reporter:  ogourgue      |      Owner:  seanfarley
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.4.1
Resolution:                |   Keywords:  highsierra
      Port:  openmpi-gcc7  |
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Comment (by aivazis):

 on my system and in rescue mode, /Volumes has two folders: "OS X Base
 System" and "osx", the latter being what I have renamed the volume with
 the running version of the system. could you please run "ls -la" in
 /Volumes when in rescue mode and show me what you get?

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Ticket URL: <https://trac.macports.org/ticket/54993#comment:14>
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