Packages like pypdfium2 need certain environment variable set dynamically before calling the get_build_backend_dependencies and get_build_sdist_dependencies. So we need to expose the extra_environ as an argument so that plugins can modify it and call the default functions
Packages like pypdfium2 need certain environment variable set dynamically before calling the
get_build_backend_dependenciesandget_build_sdist_dependencies. So we need to expose theextra_environas an argument so that plugins can modify it and call the default functions