crates/hex/cargo_embargo.json

{
  "run_cargo": false,
  "variants": [
    {},
    {
      "features": [
        "alloc"
      ],
      "module_name_overrides": {
        "libhex": "libhex_nostd"
      },
      "package": {
        "hex": {
          "alloc": true,
          "force_rlib": true,
          "host_supported": false,
          "no_std": true
        }
      }
    }
  ]
}