anchor.diff:        checking.
       '';
       homepage = "http://hol.sourceforge.net/";
  -    license = stdenv.lib.licenses.bsd3;
  +    license = licenses.bsd3;
  +    maintainers = with maintainers; [ mudri ];
     };
   }
  
positive.code: {stdenv, fetchurl, polyml, graphviz, fontconfig, liberation_ttf,
   experimentalKernel ? true}:
  
  let
    pname = "hol4";
    version = "k.8";
    holsubdir = "hol-kananaskis-8";
    kernelFlag = if experimentalKernel then "-expk" else "-stdknl";
  in
  
  stdenv.mkDerivation {
    name = "${pname}-${version}";
  
    src = fetchurl {
      url = mirror://sourceforge/hol/hol/kananaskis-8/kananaskis-8.tar.gz;
      sha256 = "5ce4c1e37301dbc38772694e98f1c7eabf69255908de204b280d8b2b1709e9d0";
    };
  
    buildInputs = [polyml graphviz fontconfig liberation_ttf];
  
    buildCommand = ''
  
  
negative.code:     # ln -s $out/src/hol4.${version}/bin $out/bin
    '';
  
    meta = with stdenv.lib; {
      description = "Interactive theorem prover based on Higher-Order Logic";
      longDescription = ''
        HOL4 is the latest version of the HOL interactive proof
  