Only define PyOS_ReadlineInit if WITH_READLINE defined.
diff --git a/Parser/myreadline.c b/Parser/myreadline.c
index 99ae6ac..d210d8b 100644
--- a/Parser/myreadline.c
+++ b/Parser/myreadline.c
@@ -100,6 +100,7 @@
 #endif /* WITH_READLINE */
 
 
+#ifdef WITH_READLINE
 void
 PyOS_ReadlineInit()
 {
@@ -111,6 +112,7 @@
 		been_here++;
 	}
 }
+#endif
 
 
 char *