From 0ab968860f88e347186a4dea489a50c3d356a44c Mon Sep 17 00:00:00 2001
From: Marcin Serwin <marcin@serwin.dev>
Date: Sun, 5 Oct 2025 00:36:22 +0200
Subject: [PATCH] maxflow: fix build with CMake 4

Signed-off-by: Marcin Serwin <marcin@serwin.dev>
---
 .../0001-Raise-minimum-CMake-version.patch    | 42 +++++++++++++++++++
 pkgs/by-name/ma/maxflow/package.nix           |  5 +++
 2 files changed, 47 insertions(+)
 create mode 100644 pkgs/by-name/ma/maxflow/0001-Raise-minimum-CMake-version.patch

diff --git a/pkgs/by-name/ma/maxflow/0001-Raise-minimum-CMake-version.patch b/pkgs/by-name/ma/maxflow/0001-Raise-minimum-CMake-version.patch
new file mode 100644
index 000000000000..42523114b071
--- /dev/null
+++ b/pkgs/by-name/ma/maxflow/0001-Raise-minimum-CMake-version.patch
@@ -0,0 +1,42 @@
+From e4d8d49beebea53f5ed71d7134528a806e89d95f Mon Sep 17 00:00:00 2001
+From: Marcin Serwin <marcin@serwin.dev>
+Date: Sun, 5 Oct 2025 00:35:33 +0200
+Subject: [PATCH] Raise minimum CMake version
+
+Compatibility with CMake versions older than 3.5 is removed in CMake 4
+and older than 3.10 is deprecated.
+
+Signed-off-by: Marcin Serwin <marcin@serwin.dev>
+---
+ CMakeLists.txt | 12 +-----------
+ 1 file changed, 1 insertion(+), 11 deletions(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 68c9781..c77176c 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -13,20 +13,10 @@
+ # You should have received a copy of the GNU General Public License
+ # along with MAXFLOW.  If not, see <http://www.gnu.org/licenses/>.
+ 
++CMAKE_MINIMUM_REQUIRED(VERSION 3.10)
+ 
+ PROJECT("maxflow")
+ 
+-CMAKE_MINIMUM_REQUIRED(VERSION 2.8.5 FATAL_ERROR)
+-
+-if(COMMAND cmake_policy)
+-  cmake_policy(SET CMP0003 NEW)
+-  cmake_policy(SET CMP0012 NEW)
+-  IF(${CMAKE_VERSION} VERSION_GREATER 3.0.0) 
+-    cmake_policy(SET CMP0042 NEW)
+-  ENDIF()
+-endif(COMMAND cmake_policy)
+-
+-
+ SET(PACKAGE_NAME "maxflow")
+ SET(MAJOR_VERSION 3)
+ SET(MINOR_VERSION 0)
+-- 
+2.51.0
+
diff --git a/pkgs/by-name/ma/maxflow/package.nix b/pkgs/by-name/ma/maxflow/package.nix
index 5615fc005456..8837d39bc76a 100644
--- a/pkgs/by-name/ma/maxflow/package.nix
+++ b/pkgs/by-name/ma/maxflow/package.nix
@@ -16,6 +16,11 @@ stdenv.mkDerivation rec {
     hash = "sha256-a84SxGMnfBEaoMEeeIFffTOtErSN5yzZBrAUDjkalGY=";
   };
 
+  patches = [
+    # https://github.com/gerddie/maxflow/pull/7
+    ./0001-Raise-minimum-CMake-version.patch
+  ];
+
   nativeBuildInputs = [ cmake ];
 
   meta = with lib; {