# NousResearch/hermes-agent · Nix flake nixpkgs channel and macOS aarch64 fixes

## Open now

- Nothing open on GitHub.

These issues and PRs address updating the nixpkgs input from the EOL nixos-24.11 channel to nixos-unstable, and resolving onnxruntime wheel compatibility failures during nix installs on macOS aarch64.

## TL;DR

- 7 member(s): 0 open issue(s), 2 closed issue(s), 0 open PR(s), 2 merged PR(s), 3 PR(s) closed without merging.
- A fix was merged to main in PR #5079. Verify it addresses your case.
- **Recommended:** read PR #5079 (and any competing PRs below) before filing. Confirm the merged change covers your symptom.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `resolved` · deciding PR(s): `pr-5079,pr-5520`. This is distinct from the fix status above. Weigh it yourself.

## How this cluster was grouped

- Link evidence (`STRUCTURAL_PARTIAL`): some members are connected by structural evidence (shared changed files, or a closing/superseded reference); the rest are joined by an automated relevance judgement over their text.
- Members outside that structural core may belong to a different underlying problem.
- Pairwise link density `0.26`: the share of member pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. `1.00` means every pair is linked.

## Closed / duplicate issues

- #4934: \[Bug\]: nix profile install fails on macOS aarch64 - onnxruntime wheel not found
- #5514: flake.nix uses the nixos-24.11 input, which is already EOL

## Prior & competing PRs

- **#5079: fix(nix): preserve voice deps on aarch64-darwin via nixpkgs**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`; implication `superseded`
  - files: `nix/python.nix`
- **#5520: fix(nix): switch nixpkgs input from nixos-24.11 to nixos-unstable**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`; implication `superseded`
  - files: `flake.nix`, `website/docs/getting-started/nix-setup.md`
  - fix hunks:
  - `flake.lock`

    ```diff
    @@ -22,16 +22,16 @@
         },
         "nixpkgs": {
           "locked": {
    -        "lastModified": 1751274312,
    -        "narHash": "sha256-/bVBlRpECLVzjV19t5KMdMFWSwKLtb5RyXdjz3LJT+g=",
    +        "lastModified": 1775036866,
    +        "narHash": "sha256-ZojAnPuCdy657PbTq5V0Y+AHKhZAIwSIT2cb8UgAz/U=",
             "owner": "NixOS",
             "repo": "nixpkgs",
    -        "rev": "50ab793786d9de88ee30ec4e4c24fb4236fc2674",
    +        "rev": "6201e203d09599479a3b3450ed24fa81537ebc4e",
             "type": "github"
           },
           "original": {
             "owner": "NixOS",
    -        "ref": "nixos-24.11",
    +        "ref": "nixos-unstable",
             "repo": "nixpkgs",
             "type": "github"
           }
    ```
  - `flake.nix`

    ```diff
    @@ -2,7 +2,7 @@
       description = "Hermes Agent - AI agent framework by Nous Research";
     
       inputs = {
    -    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
    +    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
         flake-parts = {
           url = "github:hercules-ci/flake-parts";
           inputs.nixpkgs-lib.follows = "nixpkgs";
    ```
  - `website/docs/getting-started/nix-setup.md`

    ```diff
    @@ -74,7 +74,7 @@ This module requires NixOS. For non-NixOS systems (macOS, other Linux distros),
     # /etc/nixos/flake.nix (or your system flake)
     {
       inputs = {
    -    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
    +    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
         hermes-agent.url = "github:NousResearch/hermes-agent";
       };
     
    ```
- **#4937: fix(nix): exclude voice extra on aarch64-darwin to avoid onnxruntime wheel failure**. closed without merge
  - maintainer direction: category `uncategorized`; implication `needs_llm`
- **#5542: fix(nix): switch nixpkgs input to nixos-unstable**. closed without merge
  - maintainer direction: category `superseded_by_pr`; implication `superseded`; refs `#5520`
- **#5992: docs: switch nix examples to nixos-unstable**. closed without merge
  - maintainer direction: category `superseded_by_pr`; implication `superseded`

## Fix status

- Merged to main in PR #5079 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-04-09`. This confirmation is old and may be out of date (a revert/reopen would not have invalidated it here); re-verify.
- Subsystem: `environments`