--- a/auto/options
+++ b/auto/options
@@ -85,6 +85,7 @@ HTTP_LIMIT_REQ=YES
 HTTP_EMPTY_GIF=YES
 HTTP_BROWSER=YES
 HTTP_SECURE_LINK=NO
+HTTP_DEGRADATION=NO
 HTTP_FLV=NO
 HTTP_GZIP_STATIC=NO
 HTTP_UPSTREAM_IP_HASH=YES
@@ -131,6 +132,8 @@ USE_LIBGD=NO
 NGX_GOOGLE_PERFTOOLS=NO
 NGX_CPP_TEST=NO
 
+NGX_LIBATOMIC=NO
+
 NGX_CPU_CACHE_LINE=
 
 opt=
@@ -194,6 +197,7 @@ do
         --with-http_gzip_static_module)  HTTP_GZIP_STATIC=YES       ;;
         --with-http_random_index_module) HTTP_RANDOM_INDEX=YES      ;;
         --with-http_secure_link_module)  HTTP_SECURE_LINK=YES       ;;
+        --with-http_degradation_module)  HTTP_DEGRADATION=YES       ;;
 
         --without-http_charset_module)   HTTP_CHARSET=NO            ;;
         --without-http_gzip_module)      HTTP_GZIP=NO               ;;
@@ -264,6 +268,9 @@ do
         --with-zlib-opt=*)               ZLIB_OPT="$value"          ;;
         --with-zlib-asm=*)               ZLIB_ASM="$value"          ;;
 
+        --with-libatomic)                NGX_LIBATOMIC=YES          ;;
+        --with-libatomic=*)              NGX_LIBATOMIC="$value"     ;;
+
         --test-build-devpoll)            NGX_TEST_BUILD_DEVPOLL=YES ;;
         --test-build-eventport)          NGX_TEST_BUILD_EVENTPORT=YES ;;
         --test-build-epoll)              NGX_TEST_BUILD_EPOLL=YES   ;;
@@ -322,6 +329,7 @@ cat << END
   --with-http_gzip_static_module     enable ngx_http_gzip_static_module
   --with-http_random_index_module    enable ngx_http_random_index_module
   --with-http_secure_link_module     enable ngx_http_secure_link_module
+  --with-http_degradation_module     enable ngx_http_degradation_module
   --with-http_stub_status_module     enable ngx_http_stub_status_module
 
   --without-http_charset_module      disable ngx_http_charset_module
@@ -397,6 +405,9 @@ cat << END
                                      for specified CPU, the valid values:
                                      pentium, pentiumpro
 
+  --with-libatomic                   force libatomic_ops library usage
+  --with-libatomic=DIR               set path to libatomic_ops library sources
+
   --with-openssl=DIR                 set path to OpenSSL library sources
   --with-openssl-opt=OPTIONS         set additional options for OpenSSL building