From f0c52ba807eaf3afeff01aeda746816fe44d20d6 Mon Sep 17 00:00:00 2001
From: Willy Hille <willy.hille@intenta.de>
Date: Tue, 5 May 2026 13:55:17 +0200
Subject: [PATCH] cre2: fix build

failed because of a single missing include; patch sent upstream
---
 .../cre2/missing-header-include-pr-34.patch   | 20 +++++++++++++++++++
 pkgs/by-name/cr/cre2/package.nix              |  4 ++++
 2 files changed, 24 insertions(+)
 create mode 100644 pkgs/by-name/cr/cre2/missing-header-include-pr-34.patch

diff --git a/pkgs/by-name/cr/cre2/missing-header-include-pr-34.patch b/pkgs/by-name/cr/cre2/missing-header-include-pr-34.patch
new file mode 100644
index 000000000000..8c087dcec4c5
--- /dev/null
+++ b/pkgs/by-name/cr/cre2/missing-header-include-pr-34.patch
@@ -0,0 +1,20 @@
+From 7c83c012b33a16b11e3547894118fc013ec23ca0 Mon Sep 17 00:00:00 2001
+From: Willy <jemand771@gmx.net>
+Date: Tue, 5 May 2026 13:50:44 +0200
+Subject: [PATCH] add missing cstring include
+
+fails on newer compilers/toolchains without
+---
+ src/cre2.cpp | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/cre2.cpp b/src/cre2.cpp
+index 5a63b93..3b1ec21 100644
+--- a/src/cre2.cpp
++++ b/src/cre2.cpp
+@@ -18,6 +18,7 @@
+ 
+ #include <cstdlib>
+ #include <cstdio>
++#include <cstring>
+ #include <vector>
diff --git a/pkgs/by-name/cr/cre2/package.nix b/pkgs/by-name/cr/cre2/package.nix
index 43b106f29418..9fd65596d1bb 100644
--- a/pkgs/by-name/cr/cre2/package.nix
+++ b/pkgs/by-name/cr/cre2/package.nix
@@ -20,6 +20,10 @@ stdenv.mkDerivation (finalAttrs: {
     sha256 = "1h9jwn6z8kjf4agla85b5xf7gfkdwncp0mfd8zwk98jkm8y2qx9q";
   };
 
+  patches = [
+    ./missing-header-include-pr-34.patch
+  ];
+
   nativeBuildInputs = [
     autoreconfHook
     libtool