diff -uNr memcached-1.6.9/memcached.c memcached-1.6.9.mod/memcached.c
--- memcached-1.6.9/memcached.c	2020-11-21 00:10:41.000000000 +0000
+++ memcached-1.6.9.mod/memcached.c	2020-11-22 14:22:38.466598100 +0000
@@ -14,6 +14,7 @@
  *      Brad Fitzpatrick <brad@danga.com>
  */
 #include "memcached.h"
+#include "getsubopt.h"
 #include "storage.h"
 #include "authfile.h"
 #include "restart.h"