Composer installation is unavailble

[asheral]

Some settings on your machine make Composer unable to work properly.
Make sure that you fix the issues listed below and run this script again:

The suhosin.executor.include.whitelist setting is incorrect.
Add the following to the end of your php.ini or suhosin.ini (Example path [for Debian]: /etc/php5/cli/conf.d/suhosin.ini):
suhosin.executor.include.whitelist = phar

The php.ini used by your command-line PHP is: /etc/php5/fpm/php.ini
If you can not modify the ini file, you can also run php -d option=value to modify ini values on the fly. You can use -d multiple times.

[stof]

I don't understand what this issue is about.