anchor.diff:  
     meta = with lib; {
       description = "A library written in OCaml, relying on Javalib to provide a high level representation of Java bytecode programs";
  -    homepage = webpage;
  +    homepage = "http://sawja.inria.fr/";
       license = licenses.gpl3Plus;
       maintainers = [ maintainers.vbgl ];
       platforms = ocaml.meta.platforms or [];
  
positive.code:     owner = "javalib-team";
      repo = pname;
      rev = version;
      sha256 = "sha256:0k51rscs9mdgpg3qn4cahql5ncdvlb207m015hr8v6r1vfgn0ddq";
    };
  
    nativeBuildInputs = [ which ocaml findlib ];
  
negative.code: 
  let
    pname = "sawja";
    version = "1.5.11";
  in
  
  if !lib.versionAtLeast ocaml.version "4.07"
  