[MacPorts] #41461: libdvdnav @4.2.0: upgrading from previous version fails

[MacPorts]

#41461: libdvdnav @4.2.0: upgrading from previous version fails
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  Reporter:  mk@…       |      Owner:  ryandesign@…
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  libdvdnav  |
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Comment (by ryandesign@…):

 Ok, I can see the problem now. I wasn't seeing it before because I am
 using the patch in #40656.

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Ticket URL: <https://trac.macports.org/ticket/41461#comment:6>
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