At the installation on free.fr host, one gets this message :
To run Piwik you need at least PHP version 5.1.3
Unfortunately it seems your webserver is using PHP version 5.1.3RC4-dev.
Since differences between theses two versions of PHP are probably not a real limitation for using Piwik, is it possible to manage a turn-around for this obstacle ?
I tried to set config/global.ini.php with minimum_php_version = 5.1.0 but with no success style_emoticons/<#EMO_DIR#>/sad.gif