nginx 0.8.53 *) Feature: now the "error_page" directive allows to change a status code in a redirect. *) Feature: the "gzip_disable" directive supports special "degradation" mask. *) Bugfix: a socket leak might occurred if file AIO was used. Thanks to Maxim Dounin. *) Bugfix: if the first server had no "listen" directive and there was no explicit default server, then a next server with a "listen" directive became the default server; the bug had appeared in 0.8.21.

--- a/auto/modules
+++ b/auto/modules
@@ -322,6 +322,7 @@ if [ $HTTP_SECURE_LINK = YES ]; then
 fi
 
 if [ $HTTP_DEGRADATION = YES ]; then
+    have=NGX_HTTP_DEGRADATION . auto/have
     HTTP_MODULES="$HTTP_MODULES $HTTP_DEGRADATION_MODULE"
     HTTP_SRCS="$HTTP_SRCS $HTTP_DEGRADATION_SRCS"
 fi