Environment Variables

Maturin reads a number of environment variables which you can use to configure the build process. Here is a list of all environment variables that are read by maturin:

Cargo environment variables

See environment variables Cargo reads

Python environment variables

  • VIRTUAL_ENV: Path to a Python virtual environment
  • CONDA_PREFIX: Path to a conda environment
  • MATURIN_PYTHON_SYSCONFIGDATA_DIR: Path to a directory containing a sysconfigdata*.py file
  • _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

  • PYO3_CROSS_PYTHON_VERSION: Python version to use for cross compilation
  • PYO3_CROSS_LIB_DIR: This variable can be set to the directory containing the target's libpython DSO and the associated _sysconfigdata*.py file for Unix-like targets, or the Python DLL import libraries for the Windows target.This variable can be set to the directory containing the target's libpython DSO and the associated _sysconfigdata*.py file for Unix-like targets, or the Python DLL import libraries for the Windows target.
  • PYO3_CONFIG_FILE: Path to a pyo3 config file

Networking environment variables

  • HTTP_PROXY / HTTPS_PROXY: Proxy to use for HTTP/HTTPS requests
  • REQUESTS_CA_BUNDLE / CURL_CA_BUNDLE: Path to a CA bundle to use for HTTPS requests

Other environment variables

  • MACOSX_DEPLOYMENT_TARGET: The minimum macOS version to target
  • SOURCE_DATE_EPOCH: The time to use for the timestamp in the wheel metadata
  • MATURIN_EMSCRIPTEN_VERSION: The version of emscripten to use for emscripten builds
  • MATURIN_NO_MISSING_BUILD_BACKEND_WARNING: Suppress missing build backend warning
  • TARGET_SYSROOT: The sysroot to use for auditwheel wheel when cross compiling
  • ARCHFLAGS: Flags to control the architecture of the build on macOS, for example you can use ARCHFLAGS="-arch x86_64 -arch arm64" to build universal2 wheels