anchor.diff:      inherit owner;
       repo   = pname;
       rev    = "v${version}";
  -    sha256 = "0dghqx6jbzihmga8jjwwavs0wqksgcns4z1nmwj0ds9ik3mcra30";
  +    sha256 = "1f19nc8ld0iv45jjnsvaah3ddj88s2n9wj8mrz726kzg85cfr8xj";
     };
   
     buildInputs = [ ppx_jane ppx_sexp_conv ];
  
positive.code: 
    meta = with stdenv.lib; {
      description = "Bioinformatics library for Ocaml";
      homepage = "http://${owner}.github.io/${pname}";
      maintainers = [ maintainers.bcdarwin ];
      license = licenses.gpl2;
    };
  
negative.code: 
  buildDunePackage rec {
    pname = "biocaml";
    version = "0.10.1";
  
    owner = "biocaml";
  
  