[MacPorts] #65233: po4a: build failure if perl5 is installed with mismatching variant

[MacPorts]

#65233: po4a: build failure if perl5 is installed with mismatching variant
------------------------+--------------------
 Reporter:  i0ntempest  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.7.2
 Keywords:              |       Port:  po4a
------------------------+--------------------
 By default {{{po4a}}} uses perl 5.30. I have {{{perl5 +5_34}}} installed
 and it causes this build failure. Deactivating {{{perl5}}} while still
 leaving actual {{{perl5.34}}} installed will allow it to build.

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Ticket URL: <https://trac.macports.org/ticket/65233>
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