[MacPorts] #65113: MacPorts Guide: universal_archs setting not defined for macOS 10.13 - 10.15

[MacPorts]

#65113: MacPorts Guide: universal_archs setting not defined for macOS 10.13 - 10.15
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 Reporter:  hamishmb  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.7.2
 Keywords:  guide     |       Port:
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 Hi there,

 I noticed today that the MacPorts Guide doesn't say what the
 universal_archs values are for macOS 10.13 - 10.15, unlike all other
 versions. I guess this can be assumed to be "x86_64 i386" as for 10.6 -
 10.13, but I don't want to submit a pull request without knowing. I came
 across this as I'm doing my first experiments with MacPorts on an M1 Mac
 now.

 If someone lets me know that these values are correct then I'll happily do
 the pull request.

 Hamish

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Ticket URL: <https://trac.macports.org/ticket/65113>
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