anchor.diff:  
       src = fetchurl {
          url = "mirror://sourceforge/synfig/synfig-${version}.tar.gz";
  -       sha256 = "1b4ksxnqbaq4rxlvasmrvk7z4jvjbsg4ns3cns2qcnz64dyvbgda";
  +       sha256 = "04mx321z929ngl65hfc1hv5jw37wqbh8y2avmpvajagvn6lp3zdl";
       };
   
       patches = [ ./synfig-cstring.patch ];
  
positive.code: }:
  
  let
    version = "0.64.1";
  
    ETL = stdenv.mkDerivation rec {
      name = "ETL-0.04.17";
  
      src = fetchurl {
         url = "mirror://sourceforge/synfig/${name}.tar.gz";
         sha256 = "13kpiswgcpsif9fwcplqr0405aqavqn390cjnivkn3pxv0d2q8iy";
      };
    };
  
  
negative.code: 
    src = fetchurl {
         url = "mirror://sourceforge/synfig/${name}.tar.gz";
         sha256 = "13hw4z6yx70g4mnjmvmxkk7b1qzlwmqjhxflq5dd6cqdsmfw9mc7";
      };
  
    buildInputs = [
  