nginx-0.0.1-2003-11-05-01:12:39 import
diff --git a/src/http/ngx_http.h b/src/http/ngx_http.h
index b964377..3df2188 100644
--- a/src/http/ngx_http.h
+++ b/src/http/ngx_http.h
@@ -7,6 +7,7 @@
 #include <ngx_http_request.h>
 #include <ngx_http_config.h>
 #include <ngx_http_cache.h>
+#include <ngx_http_busy_lock.h>
 #include <ngx_http_filter.h>
 #include <ngx_http_core_module.h>