Reason is probably a wrong apache config. (confixx??)
Search "php_admin_value include_path ." in your apache config and comment it.
@seotoaster-team
I recommend to integrate follow lines in install/index.php on line 20:
// Ensure library/ is on include_path
if(!set_include_path(implode(PATH_SEPARATOR, array(
ZFLIBPATH,
get_include_path(),
)))){die("Wrong includepath! check your webserver config of '
php_admin_value'") ; //or so...