--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,7 +19,7 @@
 #
 # Contact: thomas.dreibholz@gmail.com
 
-CMAKE_MINIMUM_REQUIRED(VERSION 3.16)
+CMAKE_MINIMUM_REQUIRED(VERSION 3.5)
 PROJECT(fractgen LANGUAGES C CXX)
 
 SET(BUILD_MAJOR "3")