diff -pruN 1.1.1+git20171111.6842a63-2/debian/changelog 1.1.1+git20171111.6842a63-2.1/debian/changelog
--- 1.1.1+git20171111.6842a63-2/debian/changelog	2021-08-29 11:47:15.000000000 +0000
+++ 1.1.1+git20171111.6842a63-2.1/debian/changelog	2025-10-28 13:57:49.000000000 +0000
@@ -1,3 +1,10 @@
+libcorkipset (1.1.1+git20171111.6842a63-2.1) unstable; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix FTBFS with CMake 4. (Closes: #1113131)
+
+ -- Adrian Bunk <bunk@debian.org>  Tue, 28 Oct 2025 15:57:49 +0200
+
 libcorkipset (1.1.1+git20171111.6842a63-2) unstable; urgency=medium
 
   * Add debian/gitlab-ci.yml
diff -pruN 1.1.1+git20171111.6842a63-2/debian/patches/cmake-4.patch 1.1.1+git20171111.6842a63-2.1/debian/patches/cmake-4.patch
--- 1.1.1+git20171111.6842a63-2/debian/patches/cmake-4.patch	1970-01-01 00:00:00.000000000 +0000
+++ 1.1.1+git20171111.6842a63-2.1/debian/patches/cmake-4.patch	2025-10-28 13:57:49.000000000 +0000
@@ -0,0 +1,15 @@
+Description: Fix FTBFS with CMake 4
+Author: Adrian Bunk <bunk@debian.org>
+Bug-Debian: https://bugs.debian.org/1113131
+
+--- libcorkipset-1.1.1+git20171111.6842a63.orig/CMakeLists.txt
++++ libcorkipset-1.1.1+git20171111.6842a63/CMakeLists.txt
+@@ -6,7 +6,7 @@
+ # Please see the COPYING file in this distribution for license details.
+ # ----------------------------------------------------------------------
+ 
+-cmake_minimum_required(VERSION 2.6)
++cmake_minimum_required(VERSION 3.5)
+ set(PROJECT_NAME libcorkipset)
+ set(RELEASE_DATE 2013-12-11)
+ project(${PROJECT_NAME})
diff -pruN 1.1.1+git20171111.6842a63-2/debian/patches/series 1.1.1+git20171111.6842a63-2.1/debian/patches/series
--- 1.1.1+git20171111.6842a63-2/debian/patches/series	2021-08-29 11:47:15.000000000 +0000
+++ 1.1.1+git20171111.6842a63-2.1/debian/patches/series	2025-10-28 13:57:49.000000000 +0000
@@ -1,3 +1,4 @@
 01-remove-dependency-on-git-command.patch
 02-support-cmake-threads.patch
 #autopkgtest-Use-system-library-to-run-test.patch
+cmake-4.patch