From 1f21ddd4a5a1751fd12f685f47eb5e2bcf433894 Mon Sep 17 00:00:00 2001
From: Franz Pletz <fpletz@fnordicwalking.de>
Date: Tue, 6 Aug 2024 14:23:39 +0200
Subject: [PATCH] kcollectd: fix build with rrdtool >= 1.9.0

---
 pkgs/tools/misc/kcollectd/default.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/pkgs/tools/misc/kcollectd/default.nix b/pkgs/tools/misc/kcollectd/default.nix
index c61ff5f3d72b..5a98bd8e1e93 100644
--- a/pkgs/tools/misc/kcollectd/default.nix
+++ b/pkgs/tools/misc/kcollectd/default.nix
@@ -26,6 +26,10 @@ mkDerivation rec {
     hash = "sha256-bUVL5eRQ5UkSZo562pnyEcj0fVoSC5WHRq4BfN67jEM=";
   };
 
+  postPatch = lib.optional (!lib.versionOlder rrdtool.version "1.9.0") ''
+    substituteInPlace kcollectd/rrd_interface.cc --replace-fail 'char *arg[] =' 'const char *arg[] ='
+  '';
+
   nativeBuildInputs = [
     cmake
     extra-cmake-modules