[MacPorts] #57457: Travis CI: Sometimes declared dependencies aren't installed

[MacPorts]

#57457: Travis CI: Sometimes declared dependencies aren't installed
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  Reporter:  ryandesign      |      Owner:  admin@…
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:                  |
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Comment (by ryandesign):

 If we had the wrong subport (i.e. the py-mistune stub port), the python27
 dependency wouldn't be there either, but it is.

 What I'm noticing is that in the original report about coreutils, an
 extract dependency was missing, and in the py27-mistune report, a build
 dependency was missing. Both would not be needed if we were installing
 from an archive. Somewhere in MacPorts we have code that removes build and
 extract dependencies when we are using an archive, and I suspect that's
 where the problem is. Do you know where that code is?

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Ticket URL: <https://trac.macports.org/ticket/57457#comment:3>
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