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<https://github.com/pantsbuild/pex/issues/1973|#1973 Allow system_site_packages=True in Virtualenv.create()>
New issue created by <https://github.com/PhoenixHe-TSP|PhoenixHe-TSP>
Currently PEX could create virtualenv to populate bundled packages, and in PEX code it allows to <https://github.com/pantsbuild/pex/blob/22e651589b3f2da26da6786dcbd1553fd7c8d4a6/pex/venv/virtualenv.py#L141|create venv with "--system-site-packages">, but there is no way to specify this parameter at runtime.

We want to run with venv and system-site-packages enabled, can we have an extra environment variable to specify this behavior?
<https://github.com/pantsbuild/pex|pantsbuild/pex>