+# PYTHONDONTWRITEBYTECODE=yes keeps Python from creating .pyc and .pyo
+# files. Creating .py[co] works OK for any given version of Open
+# vSwitch, but it causes trouble if you switch from a version with
+# foo/__init__.py into an (older) version with plain foo.py, since
+# foo/__init__.pyc will cause Python to ignore foo.py.
+if INCLUDE_PYTHON_COMPAT
+run_python = PYTHONPATH=$(top_srcdir)/python:$(top_srcdir)/python/compat:$$PYTHONPATH
+else
+run_python = PYTHONPATH=$(top_srcdir)/python:$$PYTHONPATH
+endif
+run_python += PYTHONDONTWRITEBYTECODE=yes $(PYTHON)
+
+