anchor.diff:  
       meta = {
         description = "Write Perl classes in Java";
  +      longDescription = ''
  +        The Inline::Java module allows you to put Java source code directly
  +        "inline" in a Perl script or module.  A Java compiler is launched and
  +        the Java code is compiled.  Then Perl asks the Java classes what
  +        public methods have been defined.  These classes and methods are
  +        available to the Perl program as if they had been written in Perl.
  +      '';
         license = with lib.licenses; [ artistic2 ];
         broken = stdenv.isDarwin; # never built on Hydra https://hydra.nixos.org/job/nixpkgs/staging-next/perl534Packages.InlineJava.x86_64-darwin
       };
  
positive.code:     };
    };
  
    MailBox = buildPerlPackage {
      version = "3.009";
      pname = "Mail-Box";
  
negative.code: 
      meta = {
        description = "AutoDia, create UML diagrams from source code";
        longDescription = ''
          AutoDia is a modular application that parses source code, XML or data
          and produces an XML document in Dia format (or images via graphviz
          and vcg).  Its goal is to be a UML / DB Schema diagram autocreation
          package.  The diagrams its creates are standard UML diagrams showing
          dependencies, superclasses, packages, classes and inheritances, as
          well as the methods, etc of each class.
  
          AutoDia supports any language that a Handler has been written for,
          which includes C, C++, Java, Perl, Python, and more.
        '';
        homepage = "http://www.aarontrevena.co.uk/opensource/autodia/";
        license = with lib.licenses; [ gpl2Plus ];
        mainProgram = "autodia.pl";
  