Laravel Integrated

I have a full working project in laravel 5 and now I am trying to use Integrated in my project.

https://github.com/laracasts/Integrated

In the Installation step it says to execute the following command: composer require laracasts/integrated --dev

When I execute the above command on my virtual machine it gives me the following error:

Problem 1 - instaclick/php-webdriver 1.4.3 requires ext-curl * -> the requested PHP extension curl is missing from your system. - instaclick/php-webdriver 1.4.2 requires ext-curl * -> the requested PHP extension curl is missing from your system. - instaclick/php-webdriver 1.4.1 requires ext-curl * -> the requested PHP extension curl is missing from your system. - instaclick/php-webdriver 1.4.0 requires ext-curl * -> the requested PHP extension curl is missing from your system. - laracasts/integrated 0.15.6 requires instaclick/php-webdriver ~1.4 -> satisfiable by instaclick/php-webdriver[1.4.0, 1.4.1, 1.4.2, 1.4.3]. - Installation request for laracasts/integrated ^0.15.6 -> satisfiable by laracasts/integrated[0.15.6]. Installation failed, reverting ./composer.json to its original content.

But when i execute this command on my virtual machine: curl --version It gives me the following result which means curl is installed:

curl 7.22.0 (x86_64-pc-linux-gnu) libcurl/7.22.0 OpenSSL/1.0.1 zlib/1.2.3.4 libidn/1.23 librtmp/2.3 Protocols: dict file ftp ftps gopher http https imap imaps ldap pop3 pop3s rtmp rtsp smtp smtps telnet tftp Features: GSS-Negotiate IDN IPv6 Largefile NTLM NTLM_WB SSL libz TLS-SRP

Please Help !