diff --git a/include/X11/extensions/XKBfile.h b/include/X11/extensions/XKBfile.h
index 1455463..d883bda 100644
--- a/include/X11/extensions/XKBfile.h
+++ b/include/X11/extensions/XKBfile.h
@@ -83,10 +83,19 @@ typedef void	(*XkbFileAddOnFunc)(
 #define	_XkbErrXReqFailure		25
 #define	_XkbErrBadImplementation	26
 
-extern const char *	_XkbErrMessages[];
-extern unsigned		_XkbErrCode;
-extern const char *	_XkbErrLocation;
-extern unsigned		_XkbErrData;
+#ifdef _MSC_VER
+# ifdef XKBFILE_BUILD
+#  define XKBFILE_EXTERN __declspec(dllexport)
+# else
+#  define XKBFILE_EXTERN __declspec(dllimport)
+# endif
+#else
+# define XKBFILE_EXTERN extern
+#endif
+XKBFILE_EXTERN const char *	_XkbErrMessages[];
+XKBFILE_EXTERN unsigned		_XkbErrCode;
+XKBFILE_EXTERN const char *	_XkbErrLocation;
+XKBFILE_EXTERN unsigned		_XkbErrData;
 
 /***====================================================================***/