/**
	 * Check the libicu version
	 */
	protected function envCheckLibicu() {
		/**
		 * This needs to be updated something that the latest libicu
		 * will properly normalize.  This normalization was found at
		 * http://www.unicode.org/versions/Unicode5.2.0/#Character_Additions
		 * Note that we use the hex representation to create the code
		 * points in order to avoid any Unicode-destroying during transit.
		 */
		$not_normal_c = $this->unicodeChar( "FA6C" );
		$normal_c = $this->unicodeChar( "242EE" );

		$useNormalizer = 'php';
		$needsUpdate = false;

		if ( function_exists( 'normalizer_normalize' ) ) {
			$useNormalizer = 'intl';
			$intl = normalizer_normalize( $not_normal_c, Normalizer::FORM_C );
			if ( $intl !== $normal_c ) {
				$needsUpdate = true;
			}
		}

		// Uses messages 'config-unicode-using-php' and 'config-unicode-using-intl'
		if ( $useNormalizer === 'php' ) {
			$this->showMessage( 'config-unicode-pure-php-warning' );
		} else {
			$this->showMessage( 'config-unicode-using-' . $useNormalizer );
			if ( $needsUpdate ) {
				$this->showMessage( 'config-unicode-update-warning' );
			}
		}
	}