WVSTART features
-expect_py_ver=$(LC_CTYPE=C "$top/config/bin/python" \
+expect_py_ver=$(LC_CTYPE=C "$top/dev/python" \
-c 'import platform; print(platform.python_version())') \
|| exit $?
actual_py_ver=$(bup features | grep Python: | sed -Ee 's/ +Python: //') || exit $?