[MacPorts] #67195: py310-dlib: Problem loading library

[MacPorts]

#67195: py310-dlib: Problem loading library
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  Reporter:  cbitterfield  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  dlib          |
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Comment (by ryandesign):

 That commit is in the code path for when libpng is not found. And the dlib
 port and its subports do not declare a dependency on libpng so it won't be
 there, at least not on buildbot builds. So the solution may be to add the
 libpng dependency and revbump. Other opportunistically-used dependencies
 may need to be added too.

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Ticket URL: <https://trac.macports.org/ticket/67195#comment:3>
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