nginx 0.8.3 *) Feature: the $upstream_cache_status variable. *) Bugfix: nginx could not be built on MacOSX 10.6. the bug had appeared in 0.8.2. *) Bugfix: nginx could not be built --without-http-cache; the bug had appeared in 0.8.2. *) Bugfix: a segmentation fault occurred in worker process, if a backend 401 error was intercepted and the backend did not set the "WWW-Authenticate" response header line. Thanks to Eugene Mychlo.

--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -2343,7 +2343,10 @@ ngx_http_proxy_merge_headers(ngx_conf_t 
     }
 
     if (conf->headers_set_hash.buckets
-        && ((conf->upstream.cache == NULL) == (prev->upstream.cache == NULL)))
+#if (NGX_HTTP_CACHE)
+        && ((conf->upstream.cache == NULL) == (prev->upstream.cache == NULL))
+#endif
+       )
     {
         return NGX_OK;
     }