My workaround (a hack not a fix) is to add the following line:
PYTHON_INCLUDES="-I${py_exec_prefix}/include"
After the following lines:
PYTHON_INCLUDES="-I${py_prefix}/include/python${PYTHON_VERSION}"
if test "$py_prefix" != "$py_exec_prefix"; then
PYTHON_INCLUDES="$PYTHON_INCLUDES
-I${py_exec_prefix}/include/python${PYTHON_VERSION}"
fi
it is still exits.
It still exists.