anchor.diff:  
     cargoSha256 = "0ghjrx7y25s6rjp06h0iyv4195x7daj57bqza01i1j4hm5nkhqhi";
   
  -  nativeBuildInputs = [ pkgconfig ];
  +  nativeBuildInputs = [ makeWrapper pkgconfig ];
   
     buildInputs = [
       curl zlib
  
positive.code:       ln -s rustup $link
      done
      popd
  
      # tries to create .rustup
      export HOME=$(mktemp -d)
  
negative.code: { stdenv, lib, runCommand, patchelf
  , fetchFromGitHub, rustPlatform, makeWrapper
  , pkgconfig, curl, zlib, Security, CoreServices }:
  
  let
    libPath = lib.makeLibraryPath [
      zlib # libz.so.1
    ];
  in
  
  rustPlatform.buildRustPackage rec {
    pname = "rustup";
  