How can I solve “laravel/horizon v1.1.0 requires ext-pcntl * -> the requested PHP extension pcntl is missing from your system”?

Question

When I run composer install on command promp, there exist error like this :

  Problem 1
    - Installation request for laravel/horizon v1.1.0 ->         


        

Answer 1

I have installed PHP 7.2 instead of 7.1 and everything works fine now. It appears that pcntl was not present in 7.1 but it's installed with php 7.2.