[MacPorts] #36957: Guide: Document the "subport" command

[MacPorts]

#36957: Guide: Document the "subport" command
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  Reporter:  dave@…       |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  guide        |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by JDLH):

 To help the future author of this documentation: a lot of the
 implementation of the "subport" command appears to be in changeset r78062
 .

 See also macports-dev thread, ''Newbie Portfile writer question: what does
 "subport" do?'' https://lists.macports.org/pipermail/macports-
 dev/2021-July/043627.html .

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Ticket URL: <https://trac.macports.org/ticket/36957#comment:14>
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