https://github.com/awesomized/libmemcached/commit/664fada99d0260fc07c77b8514979fda2175e20c

From 664fada99d0260fc07c77b8514979fda2175e20c Mon Sep 17 00:00:00 2001
From: Remi Collet <remi@remirepo.net>
Date: Wed, 21 Jan 2026 15:15:57 +0100
Subject: [PATCH] delete returns NOT_FOUND as of 1.6.40

---
 src/bin/memcapable.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/bin/memcapable.cc b/src/bin/memcapable.cc
index 122c294e..ec8cefb4 100644
--- a/src/bin/memcapable.cc
+++ b/src/bin/memcapable.cc
@@ -1074,6 +1074,7 @@ static enum test_return receive_error_response(void) {
   char buffer[80];
   execute(receive_line(buffer, sizeof(buffer)));
   verify(strncmp(buffer, "ERROR", 5) == 0 || strncmp(buffer, "CLIENT_ERROR", 12) == 0
+         || strncmp(buffer, "NOT_FOUND", 9) == 0
          || strncmp(buffer, "SERVER_ERROR", 12) == 0);
   return TEST_PASS;
 }