diff --git a/modules/core/include/opencv2/core/cvdef.h b/modules/core/include/opencv2/core/cvdef.h
index ea446b3fcb..468deaba5f 100644
--- a/modules/core/include/opencv2/core/cvdef.h
+++ b/modules/core/include/opencv2/core/cvdef.h
@@ -48,6 +48,10 @@
 //! @addtogroup core_utils
 //! @{
 
+#ifdef OPENCV_INCLUDE_PORT_FILE  // User-provided header file with custom platform configuration
+#include OPENCV_INCLUDE_PORT_FILE
+#endif
+
 #if !defined CV_DOXYGEN && !defined CV_IGNORE_DEBUG_BUILD_GUARD
 #if (defined(_MSC_VER) && (defined(DEBUG) || defined(_DEBUG))) || \
     (defined(_GLIBCXX_DEBUG) || defined(_GLIBCXX_DEBUG_PEDANTIC))