anchor.diff:  
     name = "sc-im-${version}";
   
  -  src = fetchurl {
  -    url = "https://github.com/andmarti1424/sc-im/archive/v${version}.tar.gz";
  -    sha256 = "08yks8grj5w434r81dy2knzbdhdnkc23r0d9v848mcl706xnjl6j";
  +  src = fetchFromGitHub {
  +    owner = "andmarti1424";
  +    repo = "sc-im";
  +    rev = "v${version}";
  +    sha256 = "0v6b8xksvd12vmz198vik2ranyr5mhnp85hl9yxh9svibs7jxsbb";
     };
   
     buildInputs = [ yacc ncurses libxml2 ];
  
positive.code:     make install prefix=
    '';
  
    meta = {
      homepage = "https://github.com/andmarti1424/sc-im";
      description = "SC-IM - Spreadsheet Calculator Improvised - SC fork";
      license = stdenv.lib.licenses.bsdOriginal;
      maintainers = [ stdenv.lib.maintainers.matthiasbeyer ];
      platforms = with stdenv.lib.platforms; linux; # Cannot test others
    };
  
  }
  
negative.code: { stdenv, fetchFromGitHub, yacc, ncurses, libxml2 }:
  
  let
    version = "0.2.1";
  