Link to c++ threads lib

CMakeLists.txt

@@ -1,10 +1,13 @@
-cmake_minimum_required(VERSION 3.0.0)
+cmake_minimum_required(VERSION 3.1.0)
 project(lfr_image_processing VERSION 0.1.0)
 
 include(CTest)
 enable_testing()
 
+set(THREADS_PREFER_PTHREAD_FLAG ON)
+
 find_package( OpenCV REQUIRED )
+find_package(Threads REQUIRED)
 
 include_directories( ${OpenCV_INCLUDE_DIRS}
     ${CMAKE_CURRENT_SOURCE_DIR}/Input 
@@ -35,7 +38,7 @@ target_include_directories(IntersectionHandler PRIVATE .)
 
 add_executable(lfr_image_processing lfr.cpp autonomous_mode_main.cpp)
 
-target_link_libraries( lfr_image_processing ${OpenCV_LIBS} Input Processing ControlModule Interpreter IntersectionHandler )
+target_link_libraries( lfr_image_processing ${OpenCV_LIBS} Input Processing ControlModule Interpreter IntersectionHandler Threads::Threads)
 
 set(CPACK_PROJECT_NAME ${PROJECT_NAME})
 set(CPACK_PROJECT_VERSION ${PROJECT_VERSION})