Nixpkgs version

• Unstable (25.11)

Steps to reproduce

git clone https://github.com/NixOS/nixpkgs
cd nixpkgs
git checkout nixpkgs-unstable
nix-build -A docbook2x --arg crossSystem '{ config = "aarch64-unknown-linux-gnu"; }'

Additional context

The upstream docbook2X-0.8.8.tar.gz INSTALL file states this:

The docbook2X package supports VPATH builds (building in a location other than the source directory), but any newly generated documentation will not end up in the right place for installation and redistribution.
Cross compilation is not supported at all.

System metadata

• system: "x86_64-linux"
• host os: Linux 6.15.1, NixOS, 25.05 (Warbler), 25.05.803579.70c74b02eac4
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.28.3
• channels(root): "nixos-25.05, nixos-hardware"
• nixpkgs: /nix/store/gdz4yp5sjq3b1q0g9ad9hicqsx1alvif-nixos-25.05/nixos

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