New submission from Mathieu Virbel:

With Maverick OSX (latest version), there is no /usr/include/zlib.h anymore. If 
you try to compile Python with -sysroot, it trigger a error message:

error: /usr/include/zlib.h: No such file or directory

The issue is in setup.py, where find_file is checking the existence of a 
filename, but if the filename has been found in a sysroot, it will return the 
path _without_ the sysroot.

In this case (zlib), find_file correctly find the zlib.h in 
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/usr/include/zlib.h,
 but return "/usr/include",  and then the setup.py open '/usr/include/zlib.h', 
which fail.

----------
components: Build
files: fix-setup-find-file-path.patch
keywords: patch
messages: 201245
nosy: Mathieu.Virbel
priority: normal
severity: normal
status: open
title: find_file might return a different directory than the tested file
type: behavior
versions: Python 2.7, Python 3.1, Python 3.2, Python 3.3, Python 3.4, Python 3.5
Added file: http://bugs.python.org/file32352/fix-setup-find-file-path.patch

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19389>
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