[MacPorts] #38112: RFE: add a "depends_pkg" type of dependency

[MacPorts]

#38112: RFE: add a "depends_pkg" type of dependency
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  Reporter:  egall@…      |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.1.3
Resolution:               |   Keywords:
      Port:               |
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Comment (by jmr@…):

 So installing a pkg of the port would give you something different than
 `port install`? That doesn't seem like a very good idea.

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Ticket URL: <https://trac.macports.org/ticket/38112#comment:2>
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