MacOSX: The universal build requires that users have the MacOSX10.4u SDK installed to build extensions. This patch makes distutils emit a warning when the compiler should use an SDK but that SDK is not installed, hopefully reducing some confusion.
MacOSX: The universal build requires that users have the MacOSX10.4u SDK
installed to build extensions. This patch makes distutils emit a warning when
the compiler should use an SDK but that SDK is not installed, hopefully reducing
some confusion.

pypa/setuptools,pypa/setuptools,pypa/setuptools