[MacPorts] #57227: Error on sudo port upgrade outdated on Mojave

[MacPorts]

#57227: Error on sudo port upgrade outdated on Mojave
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 Reporter:  aforeman  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:
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 I get the following error since upgrading to Mojave and using ''sudo port
 upgrade outdated'':

 Error: libcxx cannot be installed for the configured universal_archs
 'x86_64 i386' because it only supports the arch(s) ''.
 Error: Problem while installing libcxx

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Ticket URL: <https://trac.macports.org/ticket/57227>
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