--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,7 +6,7 @@
 #  - ANY_COMPILER    : skip compiler check (assumes gcc)
 #  - CMAKE_INSTALL_PREFIX : where to install
 
-cmake_minimum_required ( VERSION 3.5 )
+cmake_minimum_required ( VERSION 3.12 )
 foreach ( _dir
    "/usr/sfw" # search in "Sun FreeWare" (SunOS)
    "/opt/csw" # search in "OpenCSW" (SunOS)