[MacPorts] #54474: expat 2.2.2 fails to build on Snow Leopard -- missing arc4random_buf

[MacPorts]

#54474: expat 2.2.2 fails to build on Snow Leopard -- missing arc4random_buf
---------------------+-------------------------
  Reporter:  gnw3    |      Owner:  ryandesign
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.4.1
Resolution:          |   Keywords:  snowleopard
      Port:  expat   |
---------------------+-------------------------

Comment (by udbraumann):

 The same error occurs on 10.5.8 PPC. Does it mean that the respective
 Xcode is too old to have an acceptable arc4random, or is it missing at
 all?

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Ticket URL: <https://trac.macports.org/ticket/54474#comment:3>
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