```cmake
set_property(GLOBAL PROPERTY python_APPEND_PROJECT_ONLY_FLAGS_CMAKE_C_FLAGS -I${CMAKE_OSX_SYSROOT}/usr/include)
add_external_project_or_use_system(python
  CONFIGURE_COMMAND <SOURCE_DIR>/configure
                    --prefix=<INSTALL_DIR>
                    --enable-unicode=ucs4
                    --enable-shared
  PROCESS_ENVIRONMENT CFLAGS -I${CMAKE_OSX_SYSROOT}/usr/include
  )
set (pv_python_executable "${install_location}/bin/python3" CACHE INTERNAL "" FORCE)

add_extra_cmake_args(
  -DPYTHON_EXECUTABLE:FILEPATH=<INSTALL_DIR>/bin/python3
  -DPYTHON_INCLUDE_DIR:PATH=<INSTALL_DIR>/include/python3.6m
  -DPYTHON_LIBRARY:FILEPATH=<INSTALL_DIR>/lib/libpython3.6m.dylib
  -DVTK_PYTHON_VERSION:STRING=3)
```

Remove reference to specific SDK include
user
```cmake
add_external_project_or_use_system(python
  CONFIGURE_COMMAND <SOURCE_DIR>/configure
                    --prefix=<INSTALL_DIR>
                    --enable-unicode=ucs4
                    --enable-shared
  )
set (pv_python_executable "${install_location}/bin/python3" CACHE INTERNAL "" FORCE)

add_extra_cmake_args(
  -DPYTHON_EXECUTABLE:FILEPATH=<INSTALL_DIR>/bin/python3
  -DPYTHON_INCLUDE_DIR:PATH=<INSTALL_DIR>/include/python3.6m
  -DPYTHON_LIBRARY:FILEPATH=<INSTALL_DIR>/lib/libpython3.6m.dylib
  -DVTK_PYTHON_VERSION:STRING=3)
```
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