diff --git a/nt/ChangeLog b/nt/ChangeLog
index 44d937e4db9..eca36a06be0 100644
--- a/nt/ChangeLog
+++ b/nt/ChangeLog
@@ -1,3 +1,7 @@
+2010-11-23  Eli Zaretskii  <eliz@gnu.org>
+
+	* config.nt (EXTERNALLY_VISIBLE): Define.
+
 2010-10-13  Juanma Barranquero  <lekktu@gmail.com>
 
 	* INSTALL: Refer to `dynamic-library-alist'.
diff --git a/nt/config.nt b/nt/config.nt
index 49f823c9ba4..3df58a29ba3 100644
--- a/nt/config.nt
+++ b/nt/config.nt
@@ -281,6 +281,12 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #define INLINE
 #endif
 
+#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1))
+#define EXTERNALLY_VISIBLE __attribute__((externally_visible))
+#else
+#define EXTERNALLY_VISIBLE
+#endif
+
 #undef EMACS_CONFIGURATION
 
 #undef EMACS_CONFIG_OPTIONS