anchor.diff:    dontUnpack = true;
     dontConfigure = true;
     dontBuild = true;
  +
  +  # this is mostly downloading a pre-built artifact
  +  preferLocal = true;
   
     installPhase = ''
       runHook preInstall
  
positive.code:       --prefix PATH : "${jre}/bin" \
        --set JAVA_HOME "${jre}"
      runHook postInstall
    '';
  
    meta = with lib; {
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "mill";
    version = "0.9.9";
  
    src = fetchurl {
      url = "https://github.com/com-lihaoyi/mill/releases/download/${version}/${version}-assembly";
      sha256 = "sha256-HIT7bxMEz7jpSsYvohN9+zYuyCf/ARE7hd48YMTo9/4=";
    };
  
    nativeBuildInputs = [ makeWrapper ];
  