[MacPorts] #49972: pianod: fix configure failure when nawk is installed and gawk isn't

[MacPorts]

#49972: pianod: fix configure failure when nawk is installed and gawk isn't
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  Reporter:  ryandesign@…  |      Owner:  perette@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.3.99
Resolution:                |   Keywords:  haspatch
      Port:  pianod        |
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Comment (by perette@…):

 Replying to [ticket:49972 ryandesign@…]:
 I welcome your fix.  Thanks, Ryan.

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Ticket URL: <https://trac.macports.org/ticket/49972#comment:2>
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