[MacPorts] #51451: gnutls @3.4.12: build fails on 10.6, undefined symbol strndup.

[MacPorts]

#51451: gnutls @3.4.12: build fails on 10.6, undefined symbol strndup.
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  Reporter:  devans@…  |      Owner:  mps@…
      Type:  defect    |     Status:  reopened
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  gnutls    |
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Comment (by devans@…):

 This latest proposed fix will break builds where strndup DOES exist
 (10.7+).  I committed a tentative fix in r149004 that updates this patch
 to test for 10.4 and earlier and include AvailabilityMacros.h rather than
 Availability.h if that's the case.  Please test and advise.

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Ticket URL: <https://trac.macports.org/ticket/51451#comment:14>
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