set C and C++ standard

CMakeLists.txt

@@ -66,6 +66,8 @@ endif()
 
 set_target_properties(${PROJECT_NAME} PROPERTIES SOVERSION 3 VERSION ${PROJECT_VERSION})
 set_target_properties(${PROJECT_NAME} PROPERTIES DEBUG_POSTFIX "d")
+set_property(TARGET ${PROJECT_NAME} PROPERTY C_STANDARD 11)
+
 
 include(GNUInstallDirs)
 target_include_directories(${PROJECT_NAME} PUBLIC
@@ -186,6 +188,7 @@ if (BUILD_EXAMPLES)
     find_package(OpenCV COMPONENTS ${_OpenCV_REQUIRED_COMPONENTS} QUIET CONFIG)
     if(OpenCV_FOUND)
         enable_language(CXX)
+        set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD 17)
         # NB: contrib required for TickMeter in OpenCV 2.4. This is only required for 16.04 backwards compatibility and can be removed in the future.
         #     If we add it to the find_package initially, the demo won't build for newer OpenCV versions
         if(OpenCV_VERSION VERSION_LESS "3.0.0")