system header files in their traditional locations, like ``/usr/include`` and
``/System/Library/Frameworks``; instead they are found within a MacOSX SDK.
The Apple-supplied build tools handle this transparently and current
- versiona of Python now handle this as well. So it is no longer necessary,
+ versions of Python now handle this as well. So it is no longer necessary,
and since macOS 10.14, no longer possible to force the installation of system
headers with ``xcode-select``.