[MacPorts] #68658: bsdtar crashes with dyld missing symbol when upgrading a dependent port such as libxml2

[MacPorts]

#68658: bsdtar crashes with dyld missing symbol when upgrading a dependent port
such as libxml2
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  Reporter:  PerMildner  |      Owner:  (none)
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  base        |    Version:
Resolution:              |   Keywords:
      Port:              |
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Comment (by ryandesign):

 If it were very important to avoid the crash during the check, we could
 first look at bsdtar's list of libraries and see if they all exist. We
 already have code to do some of this in rev-upgrade; maybe that code can
 be reused here.

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Ticket URL: <https://trac.macports.org/ticket/68658#comment:36>
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