Build failure: nvtop

[brianmcgillion]

Nixpkgs version

• Unstable (25.11)

Steps to reproduce

nix build .#nvtopPackages.full

Can Hydra reproduce this build failure?

Link to Hydra build job

No response

Relevant log output

error: Package ‘cuda12.8-cuda_cuobjdump-12.8.90’ in /nix/store/0yi48zmj8b5mbarnahrrci9bid3cjrk4-source/pkgs/development/cuda-modules/packages/cuda_cuobjdump.nix:8 is marked as broken, refusing to evaluate.

       a) To temporarily allow broken packages, you can use an environment variable
          for a single invocation of the nix tools.

            $ export NIXPKGS_ALLOW_BROKEN=1

          Note: When using `nix shell`, `nix build`, `nix develop`, etc with a flake,
                then pass `--impure` in order to allow use of environment variables.

       b) For `nixos-rebuild` you can set
         { nixpkgs.config.allowBroken = true; }
       in configuration.nix to override this.

       c) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
         { allowBroken = true; }
       to ~/.config/nixpkgs/config.nix.

Additional context

nvtop depends on cudatoolkit which has been deprecated in favor of cudaPackages. However, cudaPackages.cuda_cuobjdump, has the same issues.

System metadata

❯ nix-shell -p nix-info --run "nix-info -m"

• system: "x86_64-linux"
• host os: Linux 6.17.5, NixOS, 25.11 (Xantusia), 25.11.20251028.08dacfc
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.32.2
• nixpkgs: /nix/store/p6gvrb36n5dh0cdg6d77rkpapy5kc0gq-source

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[brianmcgillion]

@ConnorBaker if you have some pointers or examples where to start. I can look at a PR. but all my attempts with cudaPackages seems broken so far.

[ConnorBaker]

Hydra definitely shouldn’t be building this because CUDA packages have an unfree license.

As for why it’s marked broken: since #437723 CUDA packages require config.cudaSupport be enabled.

See also:

• doc: add CUDA changes to 25.11 release notes #456510
• check-meta: custom remediation messages #456908

[Baughn]

Hydra definitely shouldn’t be building this because CUDA packages have an unfree license.

As for why it’s marked broken: since #437723 CUDA packages require config.cudaSupport be enabled.

See also:

• doc: add CUDA changes to 25.11 release notes #456510
• check-meta: custom remediation messages #456908

cudaSupport isn't documented in man configuration.nix, though. How does one actually enable it?

[ConnorBaker]

https://nixos.org/manual/nixpkgs/stable/#opt-cudaSupport