diff -uNr memcached-1.6.1/memcached.c memcached-1.6.1.mod/memcached.c
--- memcached-1.6.1/memcached.c	2020-03-17 04:49:39.000000000 +0200
+++ memcached-1.6.1.mod/memcached.c	2020-03-20 13:32:09.829964421 +0200
@@ -14,6 +14,7 @@
  *      Brad Fitzpatrick <brad@danga.com>
  */
 #include "memcached.h"
+#include "getsubopt.h"
 #ifdef EXTSTORE
 #include "storage.h"
 #endif