Evaluation failure: python3Packages.pyside6 (Linux-only)

[SigmaSquadron]

Steps To Reproduce

Steps to reproduce the behavior:

1. build python3Packages.pyside6 on x86-64 or Aarch64 Linux at any Nixpkgs commit after 73cdc95.

Build log

Build Log

error:
       … while evaluating the attribute 'drvPath'
         at /nix/store/py1rfigbv569s09j94f1pd3lq00irqd8-source/lib/customisation.nix:365:7:
          364|     in commonAttrs // {
          365|       drvPath = assert condition; drv.drvPath;
             |       ^
          366|       outPath = assert condition; drv.outPath;

       … while evaluating 'strict' to select 'drvPath' on it
         at /builtin/derivation.nix:1:552:
       … while calling the 'derivationStrict' builtin
         at /builtin/derivation.nix:1:208:
       … while evaluating derivation 'pyside6-6.8.0.2'
         whose name attribute is located at /nix/store/py1rfigbv569s09j94f1pd3lq00irqd8-source/pkgs/stdenv/generic/make-derivation.nix:336:7

       … while evaluating attribute 'buildInputs' of derivation 'pyside6-6.8.0.2'
         at /nix/store/py1rfigbv569s09j94f1pd3lq00irqd8-source/pkgs/stdenv/generic/make-derivation.nix:383:7:
          382|       depsHostHost                = elemAt (elemAt dependencies 1) 0;
          383|       buildInputs                 = elemAt (elemAt dependencies 1) 1;
             |       ^
          384|       depsTargetTarget            = elemAt (elemAt dependencies 2) 0;

       … in the condition of the assert statement
         at /nix/store/py1rfigbv569s09j94f1pd3lq00irqd8-source/lib/customisation.nix:352:23:
          351|             drvPath = assert condition; drv.${outputName}.drvPath;
          352|             outPath = assert condition; drv.${outputName}.outPath;
             |                       ^
          353|           } //

       … while evaluating the attribute 'handled'
         at /nix/store/py1rfigbv569s09j94f1pd3lq00irqd8-source/pkgs/stdenv/generic/check-meta.nix:507:7:
          506|       # or, alternatively, just output a warning message.
          507|       handled =
             |       ^
          508|         (

       … from call site
         at /nix/store/py1rfigbv569s09j94f1pd3lq00irqd8-source/pkgs/stdenv/generic/check-meta.nix:511:13:
          510|           else if valid == "no" then (
          511|             handleEvalIssue { inherit meta attrs; } { inherit (validity) reason errormsg; }
             |             ^
          512|           )

       … while calling 'handleEvalIssue'
         at /nix/store/py1rfigbv569s09j94f1pd3lq00irqd8-source/pkgs/stdenv/generic/check-meta.nix:269:38:
          268|
          269|   handleEvalIssue = { meta, attrs }: { reason , errormsg ? "" }:
             |                                      ^
          270|     let

       … caused by explicit throw
         at /nix/store/py1rfigbv569s09j94f1pd3lq00irqd8-source/pkgs/stdenv/generic/check-meta.nix:281:8:
          280|         else throw;
          281|     in handler msg;
             |        ^
          282|

       error: Package ‘apple-sdk-15.0’ in /nix/store/py1rfigbv569s09j94f1pd3lq00irqd8-source/pkgs/by-name/ap/apple-sdk/package.nix:115 is not available on the requested hostPlatform:
         hostPlatform.config = "x86_64-unknown-linux-gnu"
         package.meta.platforms = [
           "x86_64-darwin"
           "i686-darwin"
           "aarch64-darwin"
           "armv7a-darwin"
         ]
         package.meta.badPlatforms = [
           {
             cpu = {
               bits = 32;
             };
           }
         ]
       , refusing to evaluate.

       a) To temporarily allow packages that are unsupported for this system, you can use an environment variable
          for a single invocation of the nix tools.

            $ export NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=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.allowUnsupportedSystem = true; }
       in configuration.nix to override this.

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

Additional context

#354599 (comment)

Metadata

• system: "x86_64-linux"
• host os: Linux 6.11.7, NixOS, 24.11 (Velociraptor), 5b900e8
• multi-user?: yes
• sandbox: yes
• version: nix-env (Lix, like Nix) 2.92.0-dev-pre20241103-b1a0e3c
• nixpkgs: /nix/store/8b352i30b2x7z0lpf48gqsp13i1670vd-source

Notify maintainers

@gebner

cc @emilazy as #354599 is the likely cause for this. I don't know anything about darwin builds so I'm not sure how to fix it without breaking eval on macOS.

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