#include "cvconfig.h"
-#if defined(BUILD_SHARED_LIBS) && (defined WIN32 || defined _WIN32 || defined WINCE)
+#if defined(BUILD_SHARED_LIBS)
+#if defined WIN32 || defined _WIN32 || defined WINCE
#define CL_RUNTIME_EXPORT __declspec(dllexport)
+#elif defined __GNUC__ && __GNUC__ >= 4
+#define CL_RUNTIME_EXPORT __attribute__ ((visibility ("default")))
+#else
+#define CL_RUNTIME_EXPORT
+#endif
#else
#define CL_RUNTIME_EXPORT
#endif