[MacPorts] #64203: po4a: build failure on macOS 12

[MacPorts]

#64203: po4a: build failure on macOS 12
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  Reporter:  i0ntempest  |      Owner:  mascguy
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:  fixed       |   Keywords:
      Port:  po4a        |
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Comment (by i0ntempest):

 Okay this is actually caused by {{{perl5 +perl5_34}}} being active on my
 system which contains the symlink {{{perl}}}->{{{perl5.34}}}, not the
 {{{perl5.34}}} port itself.

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Ticket URL: <https://trac.macports.org/ticket/64203#comment:10>
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