https://src.fedoraproject.org/rpms/lib3mf/pull-request/6

Index: SDK/Examples/Cpp/CMakeLists.txt
--- SDK/Examples/Cpp/CMakeLists.txt.orig
+++ SDK/Examples/Cpp/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.6)
+cmake_minimum_required(VERSION 3.5...4.0)
 
 set(CMAKE_CXX_STANDARD 17)
 
