[MacPorts] #55079: py27-cryptography @2.1.1 does not build on PPC Leopard, Mac OS X 10.5.8, because of invalid compiler switch: cc1: error: -Werror=sign-conversion: No option -Wsign-conversion

[MacPorts]

#55079: py27-cryptography @2.1.1 does not build on PPC Leopard, Mac OS X 10.5.8,
because of invalid compiler switch: cc1: error: -Werror=sign-conversion: No
option -Wsign-conversion
--------------------------------+---------------------
  Reporter:  ballapete          |      Owner:
      Type:  defect             |     Status:  new
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:  2.4.2
Resolution:                     |   Keywords:  leopard
      Port:  py27-cryptography  |
--------------------------------+---------------------

Comment (by ballapete):

 In this case `cryptography-2.1.1/docs/faq.rst` recommends tp use a more
 up-to-date compiler.

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Ticket URL: <https://trac.macports.org/ticket/55079#comment:1>
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