anchor.diff: -{ stdenv, fetchFromGitHub, lib, autoreconfHook }:
  +{ stdenv, fetchFromGitHub, autoreconfHook }:
   
   stdenv.mkDerivation rec {
     version = "1.4.14";
     name = "tnef-${version}";
   
     src = fetchFromGitHub {
  -    owner = "verdammelt";
  -    repo = "tnef";
  -    rev = "${version}";
  +    owner  = "verdammelt";
  +    repo   = "tnef";
  +    rev    = version;
       sha256 = "0p7yji5hqq7k4pcba1cnv4jkl0fkg7jd77c1q164wk0vwinpmsc2";
     };
   
  
positive.code:     '';
      homepage = https://github.com/verdammelt/tnef;
      license = licenses.gpl2;
      maintainers = [ ];
      platforms = platforms.all;
    };
  }
  
negative.code: 
    nativeBuildInputs = [ autoreconfHook ];
  
    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.
  