diff -Naur a/modules/core/include/opencv2/core/cvdef.h b/modules/core/include/opencv2/core/cvdef.h
--- a/modules/core/include/opencv2/core/cvdef.h	2018-05-25 17:56:18.940458446 -0400
+++ b/modules/core/include/opencv2/core/cvdef.h	2018-05-25 17:58:49.270461403 -0400
@@ -482,6 +482,7 @@
 }
 #else
 #include <stdint.h>
+#if defined __cplusplus
 namespace cv {
 typedef ::int8_t int8_t;
 typedef ::uint8_t uint8_t;
@@ -494,7 +495,7 @@
 }
 #endif
 #endif
-
+#endif
 
 //! @}