From 04a36b6fe21c1ee7fa9fc3b7c681976f979f0458 Mon Sep 17 00:00:00 2001
From: Daniel Fullmer <danielrf12@gmail.com>
Date: Fri, 17 Apr 2026 04:50:28 -0700
Subject: [PATCH] openems: fix build with boost 1.89

---
 pkgs/by-name/op/openems/boost-1.89.patch | 12 ++++++++++++
 pkgs/by-name/op/openems/package.nix      |  2 ++
 2 files changed, 14 insertions(+)
 create mode 100644 pkgs/by-name/op/openems/boost-1.89.patch

diff --git a/pkgs/by-name/op/openems/boost-1.89.patch b/pkgs/by-name/op/openems/boost-1.89.patch
new file mode 100644
index 000000000000..b9d5ffeaf231
--- /dev/null
+++ b/pkgs/by-name/op/openems/boost-1.89.patch
@@ -0,0 +1,12 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index caeac56..64c1e18 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -123,7 +123,6 @@ link_directories(${HDF5_LIBRARIES})
+ # boost
+ find_package(Boost 1.46 COMPONENTS
+   thread
+-  system
+   date_time
+   serialization
+   chrono
diff --git a/pkgs/by-name/op/openems/package.nix b/pkgs/by-name/op/openems/package.nix
index d336bf62f538..76cbebac14b4 100644
--- a/pkgs/by-name/op/openems/package.nix
+++ b/pkgs/by-name/op/openems/package.nix
@@ -44,6 +44,8 @@ stdenv.mkDerivation (finalAttrs: {
       url = "https://github.com/thliebig/openEMS/commit/e02e2a8414355482145240e4c2b2464d7a26dd9e.patch";
       hash = "sha256-y3pvim/8XUKF5k7shj0D+8P6tdfSZ3E/gxTogbRtxdo=";
     })
+    # boost 1.89 removed the boost_system stub library
+    ./boost-1.89.patch
   ];
 
   nativeBuildInputs = [