Ned Deily <n...@acm.org> added the comment:

Thanks, Ronald.  Version 3 addresses various issues, including adding a search 
of $PATH for clang since xcrun is not useful in the case where the user has 
installed a standalone Command Line Tools package or has installed a Command 
Line Tools component from within Xcode but hasn't run xcode-select.  Another 
problem: the SDK path is likely going to be incorrect in the common case of an 
installer build on 10.5 or 10.6 but run on 10.7 or later.  It's tricky to get 
all the edge cases correct for that.  For now, the solution is to delete 
-sdkroot parameters from the default CFLAGS and friends if the SDK path is 
invalid; that assumes the Command Line Tools component/package has been 
installed.  If necessary, the user can override via env variables.  Also, the 
compiler validity checks are now bypassed if the user has overridden CC.  I'll 
plan to commit later today for 3.3.0b1 along with some README updates.

----------
stage: needs patch -> commit review
Added file: http://bugs.python.org/file26105/issue13950-version3.patch

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