[MacPorts] #58426: Portfile instructions: unclear about global variable ${portbuildpath}

[MacPorts]

#58426: Portfile instructions: unclear about global variable ${portbuildpath}
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  Reporter:  frankliuao   |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  guide        |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by jmroot):

 It would be easy enough to vaguely explain it as "a unique path under
 ${portdbpath}/build" or something I guess.

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Ticket URL: <https://trac.macports.org/ticket/58426#comment:5>
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