diff -Nuarp opencv-3.4.20.orig/modules/core/CMakeLists.txt opencv-3.4.20/modules/core/CMakeLists.txt
--- opencv-3.4.20.orig/modules/core/CMakeLists.txt	2023-06-27 19:29:13.000000000 +0800
+++ opencv-3.4.20/modules/core/CMakeLists.txt	2023-08-13 19:39:56.659037366 +0800
@@ -31,6 +31,10 @@ if(HAVE_TBB)
   list(APPEND extra_libs tbb)
 endif()
 
+if(HAVE_OPENMP AND DEFINED OpenMP_CXX_LIBRARIES AND OpenMP_CXX_LIBRARIES)
+  list(APPEND extra_libs ${OpenMP_CXX_LIBRARIES})
+endif()
+
 if(DEFINED WINRT AND NOT DEFINED ENABLE_WINRT_MODE_NATIVE)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /ZW")
 endif()