anchor.diff:  
     propagatedBuildInputs = [ penlight markdown ];
   
  -  meta = {
  +  meta = with stdenv.lib; {
       homepage = "http://stevedonovan.github.com/ldoc";
       description = "A Lua Documentation Tool";
       license = {
  
positive.code:   version = "1.2.2-1";
  
    src = fetchurl {
      url    = https://luarocks.org/lpty-1.2.2-1.src.rock;
      sha256 = "1vxvsjgjfirl6ranz6k4q4y2dnxqh72bndbk400if22x8lqbkxzm";
    };
    disabled = (luaOlder "5.1");
    propagatedBuildInputs = [ lua ];
  
    meta = {
      homepage = "http://www.tset.de/lpty/";
      description = "A simple facility for lua to control other programs via PTYs.";
      license = {
  
negative.code:   version = "1.5.0-1";
  
    src = fetchurl {
      url    = https://raw.githubusercontent.com/rocks-moonscript-org/moonrocks-mirror/master/lpeglabel-1.5.0-1.src.rock;
      sha256 = "068mwvwwn5n69pdm04qnk354391w9mk34jsczxql0xi5qgmz6w8j";
    };
    disabled = (luaOlder "5.1");
    propagatedBuildInputs = [ lua ];
  
    meta = with stdenv.lib; {
      homepage = "https://github.com/sqmedeiros/lpeglabel/";
      description = "Parsing Expression Grammars For Lua with Labeled Failures";
      license = {
  