Rust & OpenSSL woes

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Here is a full working example that worked for me:

{ pkgs, ... }:

let
  auto-sound-system = with pkgs; rustPlatform.buildRustPackage rec {
    pname = "auto-sound-system";
    version = "1.0.0";
    src = /home/rajas/Documents/rust-esp32c3-examples/smart-power-button;
    buildAndTestSubdir = "computer";
    cargoLock = {
      lockFile = ./Cargo.lock;
    };
    nativeBuildInputs = [
      pkg-config
      openssl
      openssl.dev
    ];
    PKG_CONFIG_PATH = "${pkgs.openssl.dev}/lib/pkgconfig";
  };
in
{
  systemd.services.auto-sound-system = {
    enable = true;
    description = "Automatically turn on/off the sound system";
    serviceConfig = {
      Type = "exec";
      ExecStart = "${auto-sound-system}/bin/smart-power-button-computer";
    };
    wantedBy = [ "multi-user.target" ];
  };
}
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