anchor.diff:  }:
   
   let
  +  strPkgs = with pkgs; [
  +    strategoPackages018.aterm 
  +    strategoPackages018.sdf
  +    strategoPackages018.strategoxt 
  +    strategoPackages018.javafront 
  +  ];
   
     pkgs = import nixpkgs {};
   
  
positive.code:         name = "webdsl";
          src = tarball;
          buildInputs = [
            pkgconfig strategoPackages.aterm strategoPackages.sdf
            strategoPackages.strategoxt strategoPackages.javafront
          ] ++ lib.optional stdenv.isLinux apacheAnt;
          
          doCheck = if stdenv.isLinux then true else false;
        };
  
negative.code:       releaseTools.nixBuild {
          name = "webdsl-java";
          src = tarball;
          buildInputs = [pkgconfig ecj apacheAnt strcJava which fastjar jdk] ++ strPkgs;
  
          configureFlags = ["--enable-java-backend"] ;
  
  