diff -r abf1f3ae4fa8 Modules/readline.c
--- a/Modules/readline.c	Sat Apr 25 00:16:10 2015 +0200
+++ b/Modules/readline.c	Sat Apr 25 23:12:34 2015 +0900
@@ -1062,7 +1062,7 @@
     rl_callback_handler_remove();
 }
 
-extern PyThreadState* _PyOS_ReadlineTState;
+PyAPI_DATA(PyThreadState*) _PyOS_ReadlineTState;
 
 static char *
 readline_until_enter_or_signal(const char *prompt, int *signal)