The normalizer is part of the extension. Although built by default , this does not necessarily mean that the specific version of PHP you are using is installed or enabled by default.
If you get the PHP version from your operating system, check to see if the package manager has a package named php-intl . If not, check php-pecl-intl . If you are using RHEL / CentOS / Scientific Linux 5.x, also see php53-intl .
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