[MacPorts] #41239: Error in MacPorts Guide section "2.1. Install X11"

[MacPorts]

#41239: Error in MacPorts Guide section "2.1. Install X11"
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  Reporter:  zhimingwangpublic@…  |      Owner:  markd@…
      Type:  defect               |     Status:  new
  Priority:  Normal               |  Milestone:
 Component:  guide                |    Version:  2.2.1
Resolution:                       |   Keywords:
      Port:                       |
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Comment (by ryandesign@…):

 You don't need to install X11 outside of MacPorts, unless you want it for
 other reasons. The documentation is out of date.

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Ticket URL: <https://trac.macports.org/ticket/41239#comment:3>
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