-`nixos-option` has been rewritten to a Nix expression called by a simple bash script. This lowers our maintenance threshold, makes eval errors less verbose, adds support for flake-based configurations, descending into `attrsOf` and `listOf` submodule options, and `--show-trace`.
- The packaging of Mesa graphics drivers has been significantly reworked, in particular:
- applications linked against different Mesa versions than installed on the system should now work correctly going forward (however, applications against older Mesa, e.g. from Nixpkgs releases before 25.05, remain broken)
- the global Mesa version can now be managed without a mass rebuild by setting `hardware.graphics.package`
- packages that used to depend on Mesa for libgbm or libdri should use `libgbm` or `dri-pkgconfig-stub` as inputs, respectively
- The `intel` video driver for X.org (from the xf86-video-intel package) which was previously removed because it was non-functional has been fixed and the driver has been re-introduced.
- The Mattermost module ({option}`services.mattermost`) and packages (`mattermost` and `mmctl`) have been substantially updated:
