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1st chunk of `doc/release-notes/rl-2511.section.md`
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# Nixpkgs 25.11 ("Xantusia", 2025.11/??) {#sec-nixpkgs-release-25.11}

## Highlights {#sec-nixpkgs-release-25.11-highlights}
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- The initial work to support native compilation on LoongArch64 has completed, with further changes currently
  in preparation. In accordance with the [Software Development and Build Convention for LoongArch Architectures](https://github.com/loongson/la-softdev-convention),
  this release sets the default march level to `la64v1.0`, covering the desktop and server processors of 3X5000
  and newer series. However, embedded chips without LSX (Loongson SIMD eXtension), such as 2K0300 SoC, are not
  supported. `pkgsCross.loongarch64-linux-embedded` can be used to build software and systems for these platforms.
- The official Nix formatter `nixfmt` is now stable and available as `pkgs.nixfmt`, deprecating the temporary `pkgs.nixfmt-rfc-style` attribute. The classic `nixfmt` will stay available for some more time as `pkgs.nixfmt-classic`.

## Backward Incompatibilities {#sec-nixpkgs-release-25.11-incompatibilities}

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- `nixVersions.nix_2_3` has been dropped because it was insecure and unmaintained.

- The minimum version of Nix required to evaluate Nixpkgs has been raised from 2.3 to 2.18.

- `mono4` and `mono5` have been removed. Use `mono6` or `mono` instead.

- The `offrss` package was removed due to lack of upstream maintenance since 2012. It's recommended for users to migrate to another RSS reader

- `installShellFiles`: Allow installManPage to take a piped input, add the `--name` flag for renaming the file when installed. Can also append `--` to opt-out of all subsequent parsing.

- GCC 9, 10, 11, and 12 have been removed, as they have reached end‐of‐life upstream and are no longer supported.

- LLVM 12, 13, 14, 15, 16, and 17 have been removed, as they have reached end‐of‐life upstream and are no longer supported.

- GHCJS 8.10, exposed via `haskell.compiler.ghcjs` and `haskell.compiler.ghcjs810`, has been removed. Downstream users should migrate their projects to the new JavaScript backend of GHC proper which can be used via `pkgsCross.ghcjs` from Nixpkgs. Haskell packaging code, like `haskellPackages.mkDerivation`, `ghcWithPackages` and `hoogleWithPackages`, also no longer supports GHCJS.

- GHC 8.6, 8.10, 9.0, 9.2, and their package sets have been removed.

- Support for bootstrapping native GHC compilers on 32‐bit ARM and little‐endian 64‐bit PowerPC has been dropped.
  The latter was probably broken anyway.
  If there is interest in restoring support for these architectures, it should be possible to cross‐compile a bootstrap GHC binary.

- `haskellPackages` and the package sets under `haskell.packages` no longer expose an `llvmPackages` attribute,
  though it can still be accessed via `ghc.llvmPackages` (from the same package set).
  Haskell packages usually only need to depend on an LLVM version matching GHC if they force the use the LLVM
  backend even if NCG is available. In this case, it is best to use the `forceLlvmCodegenBackend` helper.
  In all other cases, like linking against `libLLVM`, Haskell packages should use the appropriate version of `llvmPackages` from `pkgs`.

- `uw-ttyp0` has been updated to version 2.1. The filenames of the OTB and PSF fonts have been changed to match the upstream naming convention.
  If you were loading a font by path, for example in the `console.font` NixOS option, remember to update the filename accordingly.

- `base16-builder` node package has been removed due to lack of upstream maintenance.

- `python3Packages.bjoern` has been removed, as the upstream is unmaintained and it depends on a 14-year-old version of http-parser with numerous vulnerabilities.

- `buildGoModule` now warns if `<pkg>.passthru.overrideModAttrs` is lost during the overriding of its result packages.
Title: Nixpkgs 25.11: Highlights and Backward Incompatibilities
Summary
This document outlines the release notes for Nixpkgs 25.11, codenamed "Xantusia". Key highlights include initial support for native compilation on LoongArch64 architectures (setting `la64v1.0` as default) and the stabilization of `nixfmt` as the official Nix formatter. Backward incompatibilities are extensive, including the removal of `nixVersions.nix_2_3` and raising the minimum required Nix version to 2.18. Numerous outdated or unmaintained packages and compiler versions, such as `mono4`/`mono5`, `offrss`, GCC 9-12, LLVM 12-17, GHCJS 8.10, and older GHC versions (8.6, 8.10, 9.0, 9.2), have been removed. Additionally, support for bootstrapping native GHC on specific 32-bit ARM and 64-bit PowerPC architectures has been dropped, and `haskellPackages` no longer directly exposes `llvmPackages`.