[MacPorts] #55947: openmpi does not work with older versions of gcc

[MacPorts]

#55947: openmpi does not work with older versions of gcc
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 Reporter:  gepenn  |      Owner:
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.4.2
 Keywords:          |       Port:  openmpi
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 I installed gcc5 and then tried to install openmpi-gcc5, which failed.
 The same thing happened when I uninstalled gcc5 and tried again with gcc6
 and then openmpi-gcc6.

 This is on mac os 10.13 with a new installation of macports.

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Ticket URL: <https://trac.macports.org/ticket/55947>
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