anchor.diff:      };
       meta = {
         homepage = "http://www.tset.de/lpty";
  -      plaftorms = stdenv.lib.platforms.linux;
  +      platforms = stdenv.lib.platforms.linux;
         license = stdenv.lib.licenses.mit;
       };
       preBuild = ''
  
positive.code: 
      meta = {
        homepage = "http://www.inf.puc-rio.br/~roberto/lpeg/";
        plaftorms = stdenv.lib.platforms.all;
        license = stdenv.lib.licenses.mit;
      };
    };
  
negative.code:     disabled = isLua52;
      meta = {
        homepage = "https://github.com/luaforge/luazip";
        platforms = stdenv.lib.platforms.linux;
        license = stdenv.lib.licenses.mit;
      };
    };
  