Start Qml GUI at boot

[vitor]

Hi, I want to know, what I need to start a Qml GUI at boot.

I installed this packages and their dependencies (a lot):
xorg, xorg-xinit, xterm, qt5-quickcontrols and qt5-webkit

But, when I run at xterm the following command:
$this->bbcode_second_pass_code('', ' qmlscene example.qml ')
I got the error:
libEGL warning: DRI2: failed to authenticate

What I have to do to initialize this example at boot time?

Thanks