update c++ and opencv version

CMakeLists.txt

@@ -12,14 +12,14 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall   -O3")
 set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -march=native")
 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -march=native")
 
-# Check C++11 or C++0x support
+# Check C++14 or C++0x support
 include(CheckCXXCompilerFlag)
-CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
+CHECK_CXX_COMPILER_FLAG("-std=c++14" COMPILER_SUPPORTS_CXX11)
 CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
 if(COMPILER_SUPPORTS_CXX11)
-   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
    add_definitions(-DCOMPILEDWITHC11)
-   message(STATUS "Using flag -std=c++11.")
+   message(STATUS "Using flag -std=c++14.")
 elseif(COMPILER_SUPPORTS_CXX0X)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
    add_definitions(-DCOMPILEDWITHC0X)
@@ -30,9 +30,9 @@ endif()
 
 LIST(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake_modules)
 
-find_package(OpenCV 4.4)
+find_package(OpenCV 4.2)
    if(NOT OpenCV_FOUND)
-      message(FATAL_ERROR "OpenCV > 4.4 not found.")
+      message(FATAL_ERROR "OpenCV > 4.2 not found.")
    endif()
 
 MESSAGE("OPENCV VERSION:")