Cannot build a nix package

[Xarwex]

nix build fails with the following error:

       >    Compiling hook v0.2.10 (/build/source/hook)
       > error: proc macro panicked
       >   --> hook/src/lib.rs:12:1
       >    |
       > 12 | proxy_dll::proxy_dll!([x3daudio1_7, d3d9], init);
       >    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
       >    |
       >    = help: message: called `Result::unwrap()` on an `Err` value: Os { code: 2, kind: NotFound, message: "No such file or directory" }
       >
       > error: could not compile `hook` (lib) due to 1 previous error

cargo build completes normally.