could not find `ucontext` in `nix` for aarch64-linux-android

error[E0433]: failed to resolve: could not find `ucontext` in `nix`
  --> src\main.rs:22:39
   |
22 |             if let Ok(context) = nix::ucontext::UContext::get() {
   |                                       ^^^^^^^^ could not find `ucontext` in `nix`


nix = { version = "0.28.0", features = ["signal","ucontext"] }