--- a/CMakeLists.txt	
+++ a/CMakeLists.txt	
@@ -118,7 +118,7 @@ enable_testing()
 
 add_subdirectory(src/core)
 add_subdirectory(src/contrib)
-add_subdirectory(src/demo)
+#add_subdirectory(src/demo)
 add_subdirectory(src/test)
 
 #################################