[MacPorts] #65471: libgcc12: rev-upgrade fails due to missing libiconv

[MacPorts]

#65471: libgcc12: rev-upgrade fails due to missing libiconv
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  Reporter:  kencu     |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  libgcc12  |
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Comment (by cjones051073):

 libiconv is already a dep of gcc12, and a build dep on libgcc12. So the
 simple solution is to make a a runtime dep of both.

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Ticket URL: <https://trac.macports.org/ticket/65471#comment:3>
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