Then, git doesn't enable Windows NTFS case sensitivity. You enabled NTFS case sensitivity on "C:\Users\user\K". And Windows enabled case sensitivity for all new directories under the directory.
Since it is not default and minor setting, it is not a bug that current Python doesn't support building on case sensitive directory. But I think it is a nice improvement if next Python supports it. Regards, -- Inada Naoki <songofaca...@gmail.com> -- https://mail.python.org/mailman/listinfo/python-list