[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 ryandesign):

 It doesn't really matter to a portfile author what the value of
 `portbuildpath` is. This is not a variable a portfile author will use.
 What matters is that it is a temporary directory created for the port to
 use while a build is happening.

 You can of course see what the value is on your system by looking at the
 path that the "work" symlink in the port's directory resolves to. It will
 resolve to a path inside ${prefix}/var/macports/build.

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Ticket URL: <https://trac.macports.org/ticket/58426#comment:2>
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