✨ feat(config): add env_site_packages_dir_plat substitution#3784
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gaborbernat merged 1 commit intotox-dev:mainfrom Feb 20, 2026
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Expose the platform-specific site-packages directory (platlib) as a substitution variable. On Fedora/RHEL where lib64 is no longer symlinked to lib since virtualenv 20.x, this lets users reference the correct path for compiled extensions.
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Since virtualenv 20.x, the
lib64directory is no longer symlinked tolibon Linux distributions like Fedora and RHEL (see virtualenv#1751). This means{env_site_packages_dir}(which returns purelib) doesn't cover the platform-specificlib64/pythonX.Y/site-packagespath where compiled extensions live.🔧 The new
{env_site_packages_dir_plat}/{envsitepackagesdir_plat}substitution exposes the platlib path from virtualenv'sDescribeinterface. On most platforms (macOS, Windows) this is identical to purelib, but on affected Linux distributions it correctly resolves to thelib64directory. The basePythonclass provides a default implementation that returns purelib, so third-party runners liketox-uvcontinue to work without changes. The built-inVirtualEnvrunner overrides it to return the actual platlib.Closes #2302.