#ifdef PHP_WIN32
# define PHP_PQ_API __declspec(dllexport)
#elif defined(__GNUC__) && __GNUC__ >= 4
-# define PHP_PQ_API __attribute__ ((visibility("default")))
+# define PHP_PQ_API extern __attribute__ ((visibility("default")))
#else
-# define PHP_PQ_API
+# define PHP_PQ_API extern
#endif
#ifdef ZTS