From 952ce8842c4ea55c65c6bcbf8757638464741898 Mon Sep 17 00:00:00 2001
From: Markus Theil <markus.theil@secunet.com>
Date: Mon, 16 Mar 2026 13:19:46 +0100
Subject: [PATCH] rnp: fix build with Botan 3.11

Signed-off-by: Markus Theil <markus.theil@secunet.com>
---
 .../rnp/0001-fix-build-with-Botan-3.11.patch  | 25 +++++++++++++++++++
 pkgs/by-name/rn/rnp/package.nix               |  2 ++
 2 files changed, 27 insertions(+)
 create mode 100644 pkgs/by-name/rn/rnp/0001-fix-build-with-Botan-3.11.patch

diff --git a/pkgs/by-name/rn/rnp/0001-fix-build-with-Botan-3.11.patch b/pkgs/by-name/rn/rnp/0001-fix-build-with-Botan-3.11.patch
new file mode 100644
index 000000000000..0c8d26a42368
--- /dev/null
+++ b/pkgs/by-name/rn/rnp/0001-fix-build-with-Botan-3.11.patch
@@ -0,0 +1,25 @@
+From aa31e5d8af9295488bef3a559ec3756d5021501d Mon Sep 17 00:00:00 2001
+From: Markus Theil <markus.theil@secunet.com>
+Date: Mon, 16 Mar 2026 13:14:29 +0100
+Subject: [PATCH] fix build with Botan 3.11
+
+Signed-off-by: Markus Theil <markus.theil@secunet.com>
+---
+ src/lib/crypto/mem.cpp | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/lib/crypto/mem.cpp b/src/lib/crypto/mem.cpp
+index 94d90f54..dbd2a143 100644
+--- a/src/lib/crypto/mem.cpp
++++ b/src/lib/crypto/mem.cpp
+@@ -25,6 +25,7 @@
+  */
+ 
+ #include <cstdio>
++#include <cstring>
+ #include "mem.h"
+ #include "logging.h"
+ #include <botan/ffi.h>
+-- 
+2.53.0
+
diff --git a/pkgs/by-name/rn/rnp/package.nix b/pkgs/by-name/rn/rnp/package.nix
index 360c0f591da4..c3eff4c93851 100644
--- a/pkgs/by-name/rn/rnp/package.nix
+++ b/pkgs/by-name/rn/rnp/package.nix
@@ -35,6 +35,8 @@ stdenv.mkDerivation (finalAttrs: {
   ];
 
   patches = [
+    # tracked at https://github.com/rnpgp/rnp/pull/2381
+    ./0001-fix-build-with-Botan-3.11.patch
   ];
 
   cmakeFlags = [