Segmentation fault after install

Hello, I want to start work with phalcon so first I have to install it. I run this:

$ git clone --depth=1 "git://github.com/phalcon/cphalcon.git"
$ cd cphalcon/build
$ sudo ./install

and add extension=phalcon.so to /etc/php7/conf.d/phalcon.ini

Now when I want to run

$ php -m

to check if phalcon module is running I got this

Segmentation fault

My php version is

PHP 7.1.2 (cli) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies
    with Xdebug v2.5.0, Copyright (c) 2002-2016, by Derick Rethans
    with Zend OPcache v7.1.2, Copyright (c) 1999-2017, by Zend Technologies