anchor.diff:    buildCommand = ''
       mkdir -p $out/bin $out/share/java
       cp -v $src $out/share/java/gpsprune.jar
  -    makeWrapper ${jdk11}/bin/java $out/bin/gpsprune \
  +    makeWrapper ${jdk}/bin/java $out/bin/gpsprune \
         --add-flags "-jar $out/share/java/gpsprune.jar"
       mkdir -p $out/share/applications
       cp $desktopItem/share/applications"/"* $out/share/applications
  
positive.code: { fetchurl, stdenv, makeDesktopItem, makeWrapper, unzip, jdk11 }:
  
  stdenv.mkDerivation rec {
    pname = "gpsprune";
  
negative.code:   };
  
    nativeBuildInputs = [ makeWrapper ];
    buildInputs = [ jdk ];
  
    desktopItem = makeDesktopItem {
      name = "gpsprune";
  