[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 ryandesign@…):

 Yes but right now "port pkg" runs "port destroot", then creates a package
 of that destroot. That's what we want; that's what ports do. I can see the
 value in what you're talking about, if I wanted to distribute some
 standalone packages, and I might use that technique (running dylibbundler
 in pre-pkg) but I wouldn't commit that to the main ports tree (I'd keep
 private modified ports with those changes). And since I'd only be using
 this on my system, it wouldn't be a problem for me to need to manually
 install dylibbundler first.

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Ticket URL: <https://trac.macports.org/ticket/38112#comment:4>
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