anchor.diff:  
        buildInputs = [ libtool pkgconfig libxml2 ];
     };
  -  
  +
     # doesn't work with srcs versioning
     libmspub = stdenv.mkDerivation rec {
        version = "0.0.6";
  
positive.code:      };
  
       configureFlags = "--disable-werror";
   
       buildInputs = [ zlib libwpd libwpg pkgconfig boost icu ];  
    };
  
    # doesn't exist in srcs
  
negative.code: 
       configureFlags = "--with-boost=${boost}";
  
       buildInputs = [ boost mdds pkgconfig ];
    };
  
    fetchThirdParty = {name, md5}: fetchurl {
  