Index: trunk/xcache.c
===================================================================
--- trunk/xcache.c	(revision 972)
+++ trunk/xcache.c	(revision 974)
@@ -3852,4 +3852,10 @@
 	REGISTER_INI_ENTRIES();
 
+	if (strcmp(sapi_module.name, "cgi-fcgi") == 0) {
+		if ((getenv("PHP_FCGI_CHILDREN") == NULL) || (atoi(getenv("PHP_FCGI_CHILDREN")) < 1)) {
+			zend_error(E_ERROR, "PHP_FCGI_CHILDREN should be >= 1 and use 1 group of parent/childs model. See " XCACHE_WIKI_URL "/Faq");
+		}
+	}
+
 	xc_config_long(&xc_php_size,       "xcache.size",        "0");
 	xc_config_hash(&xc_php_hcache,     "xcache.count",       "1");