Nix: Cross-compile Hello World for mips64r6el

flake.lock

{
  "nodes": {
    "nixpkgs": {
      "locked": {
        "lastModified": 1692698134,
        "narHash": "sha256-YtMmZWR/dlTypOcwiZfZTMPr3tj9fwr05QTStfSyDSg=",
        "owner": "NixOS",
        "repo": "nixpkgs",
        "rev": "a16f7eb56e88c8985fcc6eb81dabd6cade4e425a",
        "type": "github"
      },
      "original": {
        "owner": "NixOS",
        "ref": "nixos-23.05",
        "repo": "nixpkgs",
        "type": "github"
      }
    },
    "root": {
      "inputs": {
        "nixpkgs": "nixpkgs"
      }
    }
  },
  "root": "root",
  "version": 7
}

flake.nix

# Note: build with: NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM=1 nix build --impure
{
  description = "Build Hello World on mips64r6el";
  inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-23.05;
  outputs = { self, nixpkgs }: {
    defaultPackage.x86_64-linux =
      (import nixpkgs { system = "x86_64-linux"; crossSystem = { config = "mipsisa64r6el-linux-gnuabi64"; }; }).pkgsStatic.hello;
  };
}