From dba6c890cbde98e0a428fc6d7bdbd552a35b836a Mon Sep 17 00:00:00 2001
From: Markus Kowalewski <markus.kowalewski@gmail.com>
Date: Thu, 4 Jun 2026 14:38:13 +0200
Subject: [PATCH] slurm-spank-stunnel: add backward compatibility patch

---
 .../sl/slurm-spank-stunnel/backward-compat.patch  | 15 +++++++++++++++
 pkgs/by-name/sl/slurm-spank-stunnel/package.nix   |  5 ++++-
 2 files changed, 19 insertions(+), 1 deletion(-)
 create mode 100644 pkgs/by-name/sl/slurm-spank-stunnel/backward-compat.patch

diff --git a/pkgs/by-name/sl/slurm-spank-stunnel/backward-compat.patch b/pkgs/by-name/sl/slurm-spank-stunnel/backward-compat.patch
new file mode 100644
index 000000000000..b173af0aafbb
--- /dev/null
+++ b/pkgs/by-name/sl/slurm-spank-stunnel/backward-compat.patch
@@ -0,0 +1,15 @@
+diff --git a/slurm-spank-stunnel.c b/slurm-spank-stunnel.c
+index b79cea0..c135bf5 100644
+--- a/slurm-spank-stunnel.c
++++ b/slurm-spank-stunnel.c
+@@ -41,6 +41,10 @@
+ #include <arpa/inet.h>
+ #include <errno.h>
+ 
++#ifndef SLURM_BACKWARD_COMPAT
++#define SLURM_BACKWARD_COMPAT 1
++#endif
++
+ #include <slurm/slurm.h>
+ #include <slurm/spank.h>
+ 
diff --git a/pkgs/by-name/sl/slurm-spank-stunnel/package.nix b/pkgs/by-name/sl/slurm-spank-stunnel/package.nix
index 9f9faf653a5f..4ee7ded8530e 100644
--- a/pkgs/by-name/sl/slurm-spank-stunnel/package.nix
+++ b/pkgs/by-name/sl/slurm-spank-stunnel/package.nix
@@ -16,7 +16,10 @@ stdenv.mkDerivation (finalAttrs: {
     sha256 = "15cpd49ccvzsmmr3gk8svm2nz461rvs4ybczckyf4yla0xzp06gj";
   };
 
-  patches = [ ./hostlist.patch ];
+  patches = [
+    ./hostlist.patch
+    ./backward-compat.patch
+  ];
 
   buildPhase = ''
     gcc -I${lib.getDev slurm}/include -shared -fPIC -o stunnel.so slurm-spank-stunnel.c