need help in parsing mime subject perl -

i managed emails gmail subject contains utf-8 characters ,

subject: =?utf-8?b?5l2g5aw9ios9oowlvq==?= 

i searched interent found encoded quoted-printable

i tried using shown code decode subject

use mime::quotedprint;  print decode_qp("?utf-8?b?5l2g5aw9ios9oowlvq==?="); 

but prints same message , tried removing ?utf-8? no use, can 1 me in converting above subject utf-8 characters instead of encoding above

use encode::mime::header module, in

$ perl -mencode -le 'print encode::encode("utf8", \   encode::decode("mime-header", "=?utf-8?b?5l2g5aw9ios9oowlvq==?="))' 你好 你好 

or

#! /usr/bin/env perl  use v5.10.0; use strict; use warnings;  use encode qw/ decode /;  $subject = "=?utf-8?b?5l2g5aw9ios9oowlvq==?=";  binmode stdout, ":encoding(utf-8)"; decode "mime-header", $subject;