Fatal Error: You forgot to copy 
		config.php-dist to config.php and edit it.\n";
		exit;
	}
	require_once "config.php";
	if (CONFIG_VERSION != EXPECTED_CONFIG_VERSION) {
			print "Fatal Error: Your configuration file has
			wrong version. Please copy new options from config.php-dist and
			update CONFIG_VERSION directive.\n";
		exit;	
	}
	if (!defined('RSS_BACKEND_TYPE')) {
		print "Fatal error: RSS backend type is not defined
			(config variable RSS_BACKEND_TYPE) - please check your
			configuration file.\n";
		exit;
	}
	if (RSS_BACKEND_TYPE == "magpie" && !file_exists("magpierss/rss_fetch.inc")) {
		print "Fatal Error: You forgot to place 
		MagpieRSS
		distribution in magpierss/
		subdirectory of TT-RSS tree.\n";
		exit;
	}
	if (RSS_BACKEND_TYPE == "simplepie" && !file_exists("simplepie/simplepie.inc")) {
		print "Fatal Error: You forgot to place 
		SimplePie
		distribution in simplepie/
		subdirectory of TT-RSS tree.\n";
		exit;
	}
	if (RSS_BACKEND_TYPE != "simplepie" && RSS_BACKEND_TYPE != "magpie") {
		print "Fatal Error: Invalid RSS_BACKEND_TYPE\n";
		exit;
	}
	if (CONFIG_VERSION != EXPECTED_CONFIG_VERSION) {
		return "config: your config file version is incorrect. See config.php-dist.\n";
	}
	if (file_exists("xml-export.php") || file_exists("xml-import.php")) {
		print "Fatal Error: XML Import/Export tools (xml-export.php
		and xml-import.php) could be used maliciously. Please remove them 
		from your TT-RSS instance.\n";
		exit;
	}
	if (RSS_BACKEND_TYPE != "magpie") {
		print "Fatal Error: RSS backends other than magpie are not
		supported now.\n";
		exit;
	}
	if (SINGLE_USER_MODE && DAEMON_UPDATE_LOGIN_LIMIT > 0) {
		print "Fatal Error: Please set DAEMON_UPDATE_LOGIN_LIMIT
			to 0 in single user mode.\n";
		exit;
	}
	if (USE_CURL_FOR_ICONS && ! function_exists("curl_init")) {
		print "Fatal Error: You have enabled USE_CURL_FOR_ICONS, but your PHP 
			doesn't seem to support CURL functions.";
		exit;
	} 
	if (!defined('SESSION_EXPIRE_TIME')) {
		$err_msg = "config: SESSION_EXPIRE_TIME is undefined";
	}
	if (SESSION_EXPIRE_TIME < 60) {
		$err_msg = "config: SESSION_EXPIRE_TIME is too low (less than 60)";
	}
	if (SESSION_EXPIRE_TIME < SESSION_COOKIE_LIFETIME_REMEMBER) {
		$err_msg = "config: SESSION_EXPIRE_TIME should be greater or equal to" .
			"SESSION_COOKIE_LIFETIME_REMEMBER";
	}
/*	if (defined('DISABLE_SESSIONS')) {
		$err_msg = "config: you have enabled DISABLE_SESSIONS. Please disable this option.";
} */
	if (DATABASE_BACKED_SESSIONS && SINGLE_USER_MODE) {
		$err_msg = "config: DATABASE_BACKED_SESSIONS is incompatible with SINGLE_USER_MODE";
	}
	if ($err_msg) {
		print "Fatal Error: $err_msg\n";
		exit;
	}
?>