[MacPorts] #52613: Guile-2.0.13 fails to build on Sierra

[MacPorts]

#52613: Guile-2.0.13 fails to build on Sierra
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  Reporter:  mouse07410  |      Owner:  macports-tickets@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:  sierra
      Port:  guile       |
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Comment (by ken-cunningham-webuse):

 no doubt these instructions will change someday for git, but this works
 for ports from the past 14 years.

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Ticket URL: <https://trac.macports.org/ticket/52613#comment:11>
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