[MacPorts] #53173: py-pyobjc: fails to build on 10.6, uses 10.7 SDK; stdarg.h: No such file or directory

[MacPorts]

#53173: py-pyobjc: fails to build on 10.6, uses 10.7 SDK; stdarg.h: No such file or
directory
------------------------+-------------------------
  Reporter:  mojca      |      Owner:
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  snowleopard
      Port:  py-pyobjc  |
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Comment (by ryandesign):

 You are right that it is unexpected that the pyobjc build is trying to use
 the 10.7 SDK. I don't know if that's the cause of the problem, however.

 The 10.6 buildbot machines do have the 10.7 SDK installed, because that
 was the only way to build libsdl2.

 The pyobjc setup.py file runs `/usr/bin/xcodebuild -version -sdk macosx
 Path` to determine what SDK to use. On the 10.6 buildbot machines, this
 returns `/Developer/SDKs/MacOSX10.7.sdk`, presumably because it is the
 newest installed SDK.

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Ticket URL: <https://trac.macports.org/ticket/53173#comment:1>
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