[MacPorts] #44647: p5.20-io-tty: fails to build on 10.6

[MacPorts]

#44647: p5.20-io-tty: fails to build on 10.6
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  Reporter:  mojca@…       |      Owner:  macports-tickets@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:  snowleopard
      Port:  p5.20-io-tty  |
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Comment (by mojca@…):

 This also seems a bit suspicious patch to me. It looks as if `util.h`
 won't be included with Perl 5.18.6.

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Ticket URL: <https://trac.macports.org/ticket/44647#comment:7>
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