fix building without PCRE, introduced in r2553
diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
index fbe0887..0280c63 100644
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -1611,7 +1611,6 @@
 ngx_http_find_virtual_server(ngx_http_request_t *r, u_char *host, size_t len)
 {
     u_char                    *server;
-    size_t                     ncaptures;
     ngx_uint_t                 hash;
     ngx_http_virtual_names_t  *vn;
     ngx_http_core_loc_conf_t  *clcf;
@@ -1646,6 +1645,7 @@
 #if (NGX_PCRE)
 
     if (vn->nregex) {
+        size_t                   ncaptures;
         ngx_int_t                n;
         ngx_uint_t               i;
         ngx_str_t                name;