Q:

Updating Vendors Symfony2

Hi I donwloaded and installed Symfony2 using the archive but I had a problem during the vendor's updating. 
In my principal folder Symfony I run the command php composer.phar install but I obtained the following error
Loading composer repositories with package information
Installing dependencies (including require-dev) from lock file
Your requirements could not be resolved to an installable set of packages. 
Problem 1
    - sensiolabs/security-checker v2.0.0 requires ext-curl * -> the requested PHP extension curl is missing from your system. 
    - sensiolabs/security-checker v2.0.0 requires ext-curl * -> the requested PHP extension curl is missing from your system. 
    - Installation request for sensiolabs/security-checker v2.0.0 -> satisfiable by sensiolabs/security-checker[v2.0.0]. 
What can I do? 

A:

You need to install curl:
sudo apt-get install php5-curl

Then you need to restart your web-server

