[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 ballapete):

 Hoe can software components vanish by installation? The act removing is
 called de- or uninstallation. Even when I change software +variant_a to
 software minus or plus any other variant nothing will vanish, because each
 variant is equivalent (otherwise it would be a different port).

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Ticket URL: <https://trac.macports.org/ticket/66485#comment:6>
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