@type t() :: %MobDev.NxEigenNif.Target{
  arch_dir: String.t(),
  extra_cxxflags: [String.t()],
  id: :android_arm64 | :android_arm32 | :ios_sim | :ios_device,
  nm_symbol: String.t(),
  tools_fn: (keyword() -> tools())
}

@type tools() :: %{
  cxx: [String.t()],
  ar: [String.t()],
  ranlib: [String.t()],
  nm: [String.t()]
}