[MacPorts] #65746: Build failure on G4/PPC with 10.5.8 Leopard

[MacPorts]

#65746: Build failure on G4/PPC with 10.5.8 Leopard
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  Reporter:  xanda-escuyer  |      Owner:  (none)
      Type:  request        |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:  ffmpeg powerpc leopard
      Port:  zimg           |
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Comment (by kencu):

 should be fixable by a small tweak to repair this:

 error: 'posix_memalign' was not declared in this scope

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Ticket URL: <https://trac.macports.org/ticket/65746#comment:1>
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