diff -Nuarp opencv-2.4.13.7.orig/cmake/templates/OpenCVConfig.cmake.in opencv-2.4.13.7/cmake/templates/OpenCVConfig.cmake.in
--- opencv-2.4.13.7.orig/cmake/templates/OpenCVConfig.cmake.in	2018-07-02 20:41:56.000000000 +0800
+++ opencv-2.4.13.7/cmake/templates/OpenCVConfig.cmake.in	2023-08-30 11:25:24.227478073 +0800
@@ -80,6 +80,7 @@ set(OpenCV_CUDA_VERSION @OpenCV_CUDA_VER
 set(OpenCV_USE_CUBLAS   @HAVE_CUBLAS@)
 set(OpenCV_USE_CUFFT    @HAVE_CUFFT@)
 set(OpenCV_USE_NVCUVID  @HAVE_NVCUVID@)
+set(OpenCV_USE_OPENMP   @HAVE_OPENMP@)
 
 # Android API level from which OpenCV has been compiled is remembered
 if(ANDROID)
@@ -291,6 +292,10 @@ if(OpenCV_CUDA_VERSION)
   endforeach()
 endif()
 
+if(OpenCV_USE_OPENMP)
+  find_package(OpenMP)
+endif()
+
 # ==============================================================
 #  Android camera helper macro
 # ==============================================================
diff -Nuarp opencv-2.4.13.7.orig/modules/core/CMakeLists.txt opencv-2.4.13.7/modules/core/CMakeLists.txt
--- opencv-2.4.13.7.orig/modules/core/CMakeLists.txt	2018-07-02 20:41:56.000000000 +0800
+++ opencv-2.4.13.7/modules/core/CMakeLists.txt	2023-08-30 11:41:25.374790126 +0800
@@ -52,7 +52,17 @@ else()
                           HEADERS ${lib_cuda_hdrs} ${lib_cuda_hdrs_detail})
 endif()
 
-ocv_create_module()
+if(HAVE_OPENMP)
+  if(ANDROID_NDK_MAJOR AND (ANDROID_NDK_MAJOR GREATER 20))
+    ocv_create_module(-fopenmp -static-openmp)
+  elseif(OpenMP_CXX_FOUND)
+    ocv_create_module(OpenMP::OpenMP_CXX)
+  else()
+    ocv_create_module(${OpenMP_CXX_FLAGS})
+  endif()
+else()
+  ocv_create_module()
+endif()
 ocv_add_precompiled_headers(${the_module})
 
 ocv_add_accuracy_tests()