Update environment-variables.md

PyO3 · Jul 2, 2024 · 1cbef54 · 1cbef54
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diff --git a/guide/src/environment-variables.md b/guide/src/environment-variables.md
@@ -14,6 +14,7 @@ See [environment variables Cargo reads](https://doc.rust-lang.org/cargo/referenc
 * `_PYTHON_SYSCONFIGDATA_NAME`: Name of a `sysconfigdata*.py` file
 * `MATURIN_PYPI_TOKEN`: PyPI token for uploading wheels
 * `MATURIN_PASSWORD`: PyPI password for uploading wheels
+* `MATURIN_PEP517_USE_BASE_PYTHON`: Use base Python executable instead of venv Python executable in PEP 517 build to avoid unnecessary rebuilds, should not be set when the sdist build requires packages installed in venv.
 
 ## `pyo3` environment variables