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+The package python3 provides a python interpreter that supports virtual environments:
+
+    $ tools/python3/python3.@PYTHON_VERSION_MINOR@ -m venv /path/to/venv
+    $ export VIRTUAL_ENV=/path/to/venv
+    $ export PATH=/path/to/venv/bin:$PATH
+    $ export -n PYTHONHOME
+    $ unset PYTHONHOME
+
+    See https://docs.python.org/3/library/venv.html for more details.