anchor.diff:  assert kernel != null -> lib.versionAtLeast kernel.version "4.0";
   
   let
  -  version = "1.0.beta1-9e810b1";
  +  version = "2.1.1";
   in stdenv.mkDerivation {
     pname = "ply";
     inherit version;
  
positive.code:   '';
  
    meta = with lib; {
      description = "dynamic Tracing in Linux";
      homepage = "https://wkz.github.io/ply/";
      license = [ licenses.gpl2 ];
      maintainers = with maintainers; [ mic92 mbbx6spp ];
  
negative.code:   src = fetchFromGitHub {
      owner = "iovisor";
      repo = "ply";
      rev = "899afb0c35ba2191dd7aa21f13bc7fde2655c475";
      sha256 = "0mfnfczk6kw6p15nx5l735qmcnb0pkix7ngq0j8nndg7r2fsckah";
    };
  
    preAutoreconf = ''
  