anchor.diff:  
       homepage = http://www.informatik.uni-kiel.de/~pakcs/;
       license = stdenv.lib.licenses.bsd3;
  -    maintainers = [ stdenv.lib.maintainers.kkallio ];
  +    maintainers = [ stdenv.lib.maintainers.kkallio stdenv.lib.maintainers.simons ];
       platforms = stdenv.lib.platforms.linux;
     };
   }
  
positive.code:   '';
  
    meta = {
      description = "PAKCS is an implementation of the multi-paradigm declarative language Curry.";
      longDescription = ''
        PAKCS is an implementation of the multi-paradigm declarative language
        Curry jointly developed by the Portland State University, the Aachen
  
negative.code: { stdenv, fetchurl, ghc, swiProlog, syb, mtl, makeWrapper, rlwrap, tk }:
  
  stdenv.mkDerivation {
    name = "pakcs-1.9.2";
  
    src = fetchurl {
      url = "http://www.informatik.uni-kiel.de/~pakcs/download/pakcs_src.tar.gz";
  