anchor.diff:      cp -v *.jar $out/share/java
   
       mkdir -pv $out/bin
  -    makeWrapper ${jdk.jre}/bin/java $out/bin/ecj \
  +    makeWrapper ${jdk7.jre}/bin/java $out/bin/ecj \
         --add-flags "-cp $out/share/java/ecj.jar org.eclipse.jdt.internal.compiler.batch.Main"
   
       # Add a setup hook that causes Ant to use the ECJ.
  
positive.code:     sha256 = "0swyysbyfmv068x8q1c5jqpwk5zb4xahg17aypx5rwb660f8fpbm";
    };
  
    buildInputs = [ unzip ant jdk makeWrapper ];
  
    unpackPhase = ''
      mkdir "${name}"
  
negative.code: { stdenv, fetchurl, unzip, ant, jdk7, makeWrapper }:
  
  let
    version = "3.7.2";
  