[MacPorts] #66485: While I am installing port 1 I cannot build port 2

[MacPorts]

#66485: While I am installing port 1 I cannot build port 2
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  Reporter:  ballapete    |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.8.0
Resolution:               |   Keywords:
      Port:               |
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Comment (by jmroot):

 You should be able to build, what you can't do is any operation that may
 need to install something else, including things like extract
 dependencies. Any operation involving the registry would be subject to
 TOCTOU errors if the lock were not in place.

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Ticket URL: <https://trac.macports.org/ticket/66485#comment:1>
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