Release 3.8.3 (2025-07-18)

What's Changed

Non-blocking evaluation caching

Users reported evaluation would occasionally block other evaluation processes.

The evaluation cache database is now opened in write-ahead mode to prevent delaying evaluations.

PR: DeterminateSystems/nix-src#150

New experimental feature: external-builders

This experimental feature allows Nix to call an external program for the build environment.

The interface and behavior of this feature may change at any moment without a correspondingly major semver version change.

PRs:

Full Changelog: v3.8.2...v3.8.3