The CMake min version change was somehow missing in my local tree
-cmake_minimum_required(VERSION 3.16)
+cmake_minimum_required(VERSION 3.13)
project(MouseTrackerForCubism_project)
mkdir -p build && cd build
cmake .. -D CMAKE_BUILD_TYPE=Release
-cmake --build . -j6
+cmake --build . -j 6
diff -pruN --exclude build ./demo_clean/CMakeLists.txt ./demo_dev/CMakeLists.txt
--- ./demo_clean/CMakeLists.txt 2021-02-17 01:23:17.000000000 +0000
+++ ./demo_dev/CMakeLists.txt 2021-04-28 12:32:48.468744883 +0100
-@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.16)
+@@ -1,9 +1,9 @@
+-cmake_minimum_required(VERSION 3.16)
++cmake_minimum_required(VERSION 3.13)
+
# Set app name.
set(APP_NAME Demo)
# Set directory paths.