anchor.diff:        cp -a $bin-vst.so $out/lib/vst/
         cp -a $bin.lv2/   $out/lib/lv2/ ;
       done
  +    runHook postInstall
     '';
   
     meta = with lib; {
       homepage = "https://github.com/michaelwillis/dragonfly-reverb";
       description = "A hall-style reverb based on freeverb3 algorithms";
       maintainers = [ maintainers.magnetophon ];
  -    license = licenses.gpl3;
  +    license = licenses.gpl3Plus;
       platforms = ["x86_64-linux"];
     };
   }
  
positive.code:   ];
  
    installPhase = ''
      mkdir -p $out/bin
      mkdir -p $out/lib/lv2/
      mkdir -p $out/lib/vst/
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "dragonfly-reverb";
    version = "3.2.5";
  
    src = fetchFromGitHub {
      owner = "michaelwillis";
      repo = "dragonfly-reverb";
      rev = version;
      sha256 = "14kia9wjs0nqfx4psnr3vf4x6hihkf80gb0mjzmdnnnk4cnrdydm";
      fetchSubmodules = true;
    };
  
    postPatch = ''
      patchShebangs dpf/utils/generate-ttl.sh
    '';
  
  