https://github.com/openbabel/openbabel/pull/2784.patch
From fda825d390af8b5eaf79d7b7c39c19ab5ce317ac Mon Sep 17 00:00:00 2001
From: Nicolas PARLANT <nicolas.parlant@parhuet.fr>
Date: Wed, 26 Mar 2025 10:24:42 +0000
Subject: [PATCH] cmake4 compat :

* up cmake_minimum_required to 3.10
* delete CMP0042 because OLD behavior is removed in cmake-4 and
is no longer used.
* set ENABLE_EXPORTS for test_runner (OLD behavior for CMP0065 is removed
in cmake4)

Signed-off-by: Nicolas PARLANT <nicolas.parlant@parhuet.fr>
---
 CMakeLists.txt                                | 7 ++-----
 doc/examples/static_executable/CMakeLists.txt | 2 +-
 scripts/CMakeLists.txt                        | 2 +-
 test/CMakeLists.txt                           | 1 +
 4 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9d2a9f143e..f8440e412e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,6 @@
-# Please ensure that any changes remain compliant with 3.1.
+# Please ensure that any changes remain compliant with 3.10.
 if(NOT EMBED_OPENBABEL)
-  cmake_minimum_required(VERSION 3.1)
+  cmake_minimum_required(VERSION 3.10)
 endif()
 
 project(openbabel)
@@ -10,9 +10,6 @@ set (CMAKE_CXX_STANDARD 11)
 
 if(COMMAND cmake_policy)
   cmake_policy(SET CMP0003 NEW)
-  if(POLICY CMP0042)
-    cmake_policy(SET CMP0042 OLD)
-  endif()
 endif()
 
 include (CheckCXXCompilerFlag)
diff --git a/doc/examples/static_executable/CMakeLists.txt b/doc/examples/static_executable/CMakeLists.txt
index 0ed21beaaf..63dae2a468 100644
--- a/doc/examples/static_executable/CMakeLists.txt
+++ b/doc/examples/static_executable/CMakeLists.txt
@@ -25,7 +25,7 @@
 #
 
 # This line is required for cmake backwards compatibility.
-cmake_minimum_required(VERSION 2.6)
+cmake_minimum_required(VERSION 3.10)
 
 # Name of your project
 project(myproject)
diff --git a/scripts/CMakeLists.txt b/scripts/CMakeLists.txt
index 792e4592d0..eafda66c5a 100644
--- a/scripts/CMakeLists.txt
+++ b/scripts/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.6.0)
+cmake_minimum_required(VERSION 3.10.0)
 # Library versioning (used in Mac Python bindings)x
 set(SOVERSION 4)
 
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 2ecf0dbe22..280eac471f 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -152,6 +152,7 @@ endif()
 
 add_executable(test_runner ${srclist} obtest.cpp)
 target_link_libraries(test_runner ${libs})
+set_target_properties(test_runner PROPERTIES ENABLE_EXPORTS TRUE)
 
 if(NOT BUILD_SHARED AND NOT BUILD_MIXED)
   set_target_properties(test_runner PROPERTIES LINK_SEARCH_END_STATIC TRUE)