anchor.diff:  in stdenv.mkDerivation rec {
     inherit pname version src;
   
  -  nativeBuildInputs = [ gradle_5 ];
  +  nativeBuildInputs = [ gradle ];
   
     buildPhase = ''
       export GRADLE_USER_HOME=$(mktemp -d)
  
positive.code: 
      outputHashAlgo = "sha256";
      outputHashMode = "recursive";
      outputHash = "12b7lw1zpj69pv4bpbrm6pi0ip02ay3dfj3vcy2jyikfbwdb3qcz";
    };
  
    # Point to our local deps repo
  
negative.code: 
    installPhase = ''
      mkdir -p $out/{bin,share/pdftk,share/man/man1}
      cp build/libs/pdftk-all.jar $out/share/pdftk
  
      cat  << EOF > $out/bin/pdftk
      #!${runtimeShell}
      exec ${jre}/bin/java -jar "$out/share/pdftk/pdftk-all.jar" "\$@"
      EOF
      chmod a+x "$out/bin/pdftk"
  
  