[MacPorts] #63360: libsdl2: fails to build due to unknown builtin '__builtin_bswap16'

[MacPorts]

#63360: libsdl2: fails to build due to unknown builtin '__builtin_bswap16'
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  Reporter:  mrkapqa  |      Owner:  jmroot
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.7.1
Resolution:           |   Keywords:  lion
      Port:  libsdl2  |
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Comment (by mrkapqa):

 çkencu, please let me know which is the proper route for installing clang,
 as i have installed only xcode 4.6.3 for mountain lion 10.8;
 xcode 5.0 and xcode 5.0.2 is no longer downloadable it seems on the
 applesite (gives me "forbidden") and xcode 5.1.1 requires 10.8.4.

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Ticket URL: <https://trac.macports.org/ticket/63360#comment:3>
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