How to use Gecko in my web browser as web engine

malay emailme <[email protected]> Wed, 31 Jan 2018 12:53:19 +0530

Newsgroups	gmane.comp.mozilla.devel.layout
Message-ID	<CAHdemP8KTXkENgU2hNwtzxn+pfEpVaNFb=Mpxmehpr=gbEhJLg@mail.gmail.com>

Dear Sir,
           I want to build a web browser in qt and i want gecko as my
default web engine.Please guide me how to use.
                                                                 from
                                                                malay