anchor.diff:  
     nativeBuildInputs = [ autoreconfHook ];
   
  -  meta = with lib; {
  +  meta = with stdenv.lib; {
       description = "Unpacks MIME attachments of type application/ms-tnef";
       longDescription = ''
         TNEF is a program for unpacking MIME attachments of type "application/ms-tnef". This is a Microsoft only attachment.
  
positive.code:     '';
      homepage = https://github.com/verdammelt/tnef;
      license = licenses.gpl2;
      maintainers = [ ];
      platforms = platforms.all;
    };
  }
  
negative.code: { stdenv, fetchFromGitHub, autoreconfHook }:
  
  stdenv.mkDerivation rec {
    version = "1.4.14";
    name = "tnef-${version}";
  
    src = fetchFromGitHub {
      owner  = "verdammelt";
      repo   = "tnef";
      rev    = version;
      sha256 = "0p7yji5hqq7k4pcba1cnv4jkl0fkg7jd77c1q164wk0vwinpmsc2";
    };
  
  