[MacPorts] #54519: py27-cryptography @2.0: error: -Werror=sign-conversion: No option -Wsign-conversion

[MacPorts]

#54519: py27-cryptography @2.0: error: -Werror=sign-conversion: No option -Wsign-
conversion
------------------------------+---------------------------------------
  Reporter:  ballapete        |      Owner:  stromnov
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.4.1
Resolution:                   |   Keywords:  tiger leopard snowleopard
      Port:  py-cryptography  |
------------------------------+---------------------------------------

Comment (by kencu):

 For a data point, it builds for me on 10.6.8 without modification:
 {{{
   py27-cryptography @2.1.4_0 (active) platform='darwin 10' archs='x86_64'
 date='2017-12-10T20:27:12-0800'
 }}}
 I have my default compiler set to clang-3.9, and I'm set up using
 LibcxxOnOlderSystems.

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Ticket URL: <https://trac.macports.org/ticket/54519#comment:6>
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